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Severity
HIGH
CVSS
8.8
Priority
0.529
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Executive Summary
Mozilla released Firefox 150 addressing 41 security vulnerabilities, several rated high-severity with remote code execution potential, representing a significant patch cycle for the browser. According to third-party reporting, Mozilla used Anthropic's Mythos AI-assisted bug-finding tool to identify approximately 271 potential vulnerabilities across the Firefox codebase, suggesting that additional remediation may be staged for subsequent releases. For organizations running Firefox at scale, this release signals both an immediate patching obligation and a broader shift in how AI-assisted tooling is changing the volume and velocity of vulnerability discovery.
Plain & Simple
Here’s what you need to know.
No jargon. Just the basics.
👤
Are you affected?
Yes, if you use Firefox on your computer or laptop, you need to update it now.
✅
Do this now
1 Open Firefox, click the menu (three lines), go to Help, then About Firefox, and install any available update. 2 Restart Firefox after the update to make sure the new version is fully applied. 3 Check that your Firefox version now shows 150 or higher in the About Firefox window.
👀
Watch for these
Firefox behaving strangely or opening pages you did not request.
New programs or toolbars appearing on your computer after browsing.
Unexpected password reset emails for accounts you use in Firefox.
🌱
Should you worry?
There is no evidence that attackers are currently using these security gaps to target regular people. Updating Firefox takes about two minutes and fully removes the risk.
Want more detail? Switch to the full analyst view →
Impact Assessment
CISA KEV Status
Not listed
Threat Severity
HIGH
High severity — prioritize for investigation
TTP Sophistication
LOW
2 MITRE ATT&CK techniques identified
Detection Difficulty
MEDIUM
Standard detection methods apply
Target Scope
INFO
Mozilla Firefox < 150
Are You Exposed?
⚠
You use products/services from Mozilla Firefox < 150 → Assess exposure
✓
Your EDR/XDR detects the listed IOCs and TTPs → Reduced risk
✓
You have incident response procedures for this threat type → Prepared
Business Context
Organizations running Firefox across their workforce face immediate patching obligations; delayed remediation leaves endpoints exposed to remote code execution that requires no user credential or elevated privilege to trigger beyond visiting a malicious page. The disclosure that AI tooling identified nearly 271 vulnerabilities in Firefox's codebase signals a structural shift in vulnerability discovery economics — security and product teams should anticipate higher patch volumes and shorter windows between discovery and weaponization across browser vendors, not just Mozilla. Organizations in regulated industries where browser-mediated data access is common, such as healthcare and financial services, face compounded risk if patching cadence does not keep pace with accelerating disclosure rates.
You Are Affected If
Your organization deploys Mozilla Firefox (any version below 150) on managed or unmanaged endpoints
Your workforce uses Firefox for accessing internal web applications, SaaS platforms, or customer-facing portals
Your environment includes developer workstations or CI/CD systems that use Firefox or a Gecko-based browser engine
Your endpoint management policy permits user-controlled browser versions without enforced minimum version requirements
Your organization operates in a sector where web-based workflows are primary (healthcare, financial services, legal, government) and browser compromise would provide direct access to sensitive data
Board Talking Points
Mozilla released a major Firefox security update addressing multiple high-severity flaws that could allow an attacker to take control of a device simply by directing a user to a malicious website.
IT and security teams should complete the Firefox 150 update across all managed devices within 48 to 72 hours, with confirmation reporting back to leadership by end of week.
Organizations that do not patch promptly face elevated risk of endpoint compromise through one of the most common corporate tools in use, with no additional attacker access required beyond delivering a link.
Technical Analysis
Mozilla Security Advisory MFSA2026-30 documents 41 vulnerabilities addressed in Firefox 150, with multiple high-severity findings carrying remote code execution potential.
The MITRE technique mapping to T1190 (Exploit Public-Facing Application) and T1203 (Exploitation for Client Execution) frames the attack surface clearly: a threat actor exploiting these flaws could compromise an unpatched browser through a malicious webpage or embedded content, executing arbitrary code in the context of the logged-in user without any additional authentication bypass required.
The more analytically significant dimension of this release is the AI tooling disclosure.
According to secondary reporting, Mozilla's use of Anthropic's Mythos platform identified approximately 271 potential vulnerabilities in Firefox's codebase, a figure nearly seven times larger than the 41 addressed in the official advisory. This discrepancy is not unusual in large remediation cycles; vendors routinely batch, triage, and stage fixes across multiple releases, but the scale here warrants attention. Security teams should not interpret 'Firefox 150 patches 41 flaws' as the complete picture; additional fixes may be staged for subsequent releases. This claim should be verified against official Mozilla announcements.
No CVSS base scores have been officially published by NVD at this time; full technical details including severity scoring should be retrieved directly from MFSA2026-30 at Mozilla's advisory portal. No CVE identifiers, CWE mappings, or EPSS scores are available in the provided source data. Exploitation status is currently unknown. No entries appear in the CISA Known Exploited Vulnerabilities catalog or VulnCheck KEV for these findings as of this writing, but the absence of KEV listing does not indicate low exploitation risk for high-severity RCE-class browser vulnerabilities. Historically, browser vulnerabilities of this severity class have seen weaponized exploitation within days to weeks of public advisory release.
For enterprise environments, browser vulnerabilities in this severity class are a persistent challenge. Endpoint management solutions vary in patch propagation speed, and users running unmanaged or personal Firefox installations represent a gap that centralized patching cannot close. The AI-assisted discovery angle also raises a forward-looking implication: if tooling like Mythos is being applied systematically, patch volumes across the ecosystem may increase materially, accelerating the cadence pressure on vulnerability management programs.
Action Checklist IR ENRICHED
Triage Priority:
IMMEDIATE
Escalate to CISO and activate IR plan if any endpoint shows Firefox process spawning an unexpected child process (Sysmon Event ID 1 / Windows Security Event ID 4688 with firefox.exe as parent), if DNS or proxy logs show outbound connections to newly-registered or uncategorized domains from a Firefox process during the pre-patch exposure window, or if the affected environment processes PII, PHI, or PCI-scoped data — any of which triggers potential breach notification obligations under HIPAA, GDPR, or PCI DSS given a CVSS 8.8 RCE-class vulnerability with confirmed exposure.
1
Step 1: Containment — Query your asset management system to enumerate all Firefox installations across managed endpoints, including ESR builds, development workstations, and kiosk deployments running Firefox as a browser engine. Flag any asset running Firefox < 150 as non-compliant. (Cite: CIS 1.1 — Establish and Maintain Detailed Enterprise Asset Inventory / CIS 2.1 — Establish and Maintain a Software Inventory / CIS 2.2 — Ensure Authorized Software is Currently Supported)
IR Detail
Preparation
NIST 800-61r3 §2 — Preparation: asset inventory and exposure baseline before active incident
NIST SI-5 (Security Alerts, Advisories, and Directives)
NIST RA-5 (Vulnerability Monitoring and Scanning)
CIS 1.1 (Establish and Maintain Detailed Enterprise Asset Inventory)
CIS 2.1 (Establish and Maintain a Software Inventory)
CIS 2.2 (Ensure Authorized Software is Currently Supported)
CIS 7.1 (Establish and Maintain a Vulnerability Management Process)
Compensating Control
Run `wmic product where "name like 'Mozilla Firefox%'" get name,version /format:csv > firefox_inventory.csv` across Windows endpoints via PSExec or a scheduled task pushed through Group Policy. On macOS, use `sudo find /Applications -name 'Firefox.app' -maxdepth 2 -exec defaults read {}/Contents/Info.plist CFBundleShortVersionString \; 2>/dev/null`. For Linux, run `dpkg -l firefox* 2>/dev/null || rpm -qa firefox*` via SSH loop script. Pipe all results to a central share for manual triage. Cross-reference against AD-joined machine list to identify gap (unmanaged or BYOD). For kiosk/embedded: physically or remotely check about:version via Firefox CLI flag `firefox --version`.
Preserve Evidence
Before remediating, capture a software inventory snapshot showing current Firefox version per host (hostname, OS, version, last-seen timestamp) — this establishes the pre-patch exposure window for any post-incident timeline reconstruction. If breach investigation later surfaces a client-side exploit (T1203) delivered during this window, the version snapshot proves which hosts were vulnerable and for how long. Export from Intune/SCCM device compliance reports or osquery: `SELECT name, version, install_date FROM programs WHERE name LIKE '%Firefox%';`
2
Step 2: Detection — Before patching completes, enable endpoint telemetry to detect active exploitation of T1203: alert on firefox.exe spawning cmd.exe, powershell.exe, wscript.exe, or mshta.exe as child processes. Monitor for unusual outbound connections from firefox.exe to newly registered domains or non-standard ports. Review audit records to establish which endpoints accessed suspicious external content prior to patching. (Cite: NIST AU-2 — Event Logging / NIST AU-6 — Audit Record Review, Analysis, And Reporting / NIST AU-3 — Content Of Audit Records / D3-SFA — System File Analysis / D3-EBWSAM — Endpoint-based Web Server Access Mediation)
IR Detail
Eradication
NIST 800-61r3 §3.4 — Eradication: eliminating the vulnerability from the environment through verified patching
NIST SI-2 (Flaw Remediation)
NIST CM-6 (Configuration Settings)
CIS 7.3 (Perform Automated Operating System Patch Management)
CIS 7.4 (Perform Automated Application Patch Management)
CIS 7.2 (Establish and Maintain a Remediation Process)
Compensating Control
Without enterprise patch management, use Mozilla's MSI installer with silent deployment: `msiexec /i Firefox_Setup_150.0.msi /quiet /norestart`. Script a post-install version check: `"C:\Program Files\Mozilla Firefox\firefox.exe" --version | findstr "150"` and log result to a network share with hostname prepended. On macOS, use `brew upgrade --cask firefox` or deploy the PKG via `installer -pkg Firefox\ 150.pkg -target /`. Verify with `osquery` query: `SELECT version FROM programs WHERE name = 'Mozilla Firefox' AND version < '150.0';` — any result indicates a non-compliant host. Schedule this query as a pack to run every 6 hours for 72 hours post-deployment.
Preserve Evidence
Before pushing the patch, capture Firefox process telemetry on a representative sample of endpoints: running processes, open network connections from the Firefox process (netstat -b or `ss -tp`), and any active browser extension IDs from the Firefox profile directory (`%APPDATA%\Mozilla\Firefox\Profiles\*.default\extensions.json` on Windows, `~/Library/Application Support/Firefox/Profiles/` on macOS). If an exploit was already delivered pre-patch, this preserves runtime state. Also snapshot Firefox crash reports at `%APPDATA%\Mozilla\Firefox\Crash Reports\submitted\` — RCE exploit attempts against memory corruption vulnerabilities (the mechanism for the high-severity flaws in MFSA2026-30) frequently generate crash telemetry before successful exploitation.
3
Step 3: Eradication — Deploy Firefox 150 through your endpoint management platform (Intune, SCCM, Jamf, or equivalent). Enforce version compliance — confirm enforcement is not advisory-only. Verify version telemetry confirms 150 across the fleet. Remove or quarantine any Firefox installation that cannot be updated. For unmanaged personal devices on corporate networks, require confirmed update or restrict access via endpoint compliance policy. (Cite: CIS 7.3 — Perform Automated Operating System Patch Management / CIS 7.4 — Perform Automated Application Patch Management / CIS 7.2 — Establish and Maintain a Remediation Process / CIS 2.3 — Address Unauthorized Software)
IR Detail
Containment
NIST 800-61r3 §3.3 — Containment: isolating or restricting vulnerable systems to limit attack surface while remediation proceeds
NIST AC-17 (Remote Access)
NIST AC-20 (Use of External Systems)
NIST IR-4 (Incident Handling)
CIS 6.3 (Require MFA for Externally-Exposed Applications)
CIS 6.4 (Require MFA for Remote Network Access)
CIS 4.5 (Implement and Manage a Firewall on End-User Devices)
Compensating Control
Without a NAC appliance, use an interim DNS-layer block: configure your internal DNS resolver (e.g., Pi-hole or Windows DNS) to return NXDOMAIN for known malicious redirect domains associated with browser exploit kit delivery (reference ET OPEN or abuse.ch URLhaus feeds filtered for browser exploits). Alternatively, push a browser-agnostic GPO that restricts outbound access from endpoints not meeting a compliance tag. For BYOD attestation without tooling, deploy a lightweight osquery agent (`osquery` is free, cross-platform) with the query `SELECT version FROM programs WHERE name LIKE '%Firefox%'` and collect results via `osqueryd` log shipping to a shared folder — flag any result below 150.0 as non-compliant and block network segment access via VLAN reassignment.
Preserve Evidence
Before enforcing NAC/compliance checks, capture the list of unmanaged devices currently on the corporate network segment (ARP table exports, DHCP lease logs, switch MAC address tables) alongside their last-seen timestamps. For any device that connected to the corporate network while running Firefox < 150, preserve network flow data (NetFlow/sFlow exports or Windows Firewall log at `%SystemRoot%\System32\LogFiles\Firewall\pfirewall.log`) covering the exposure window. Browser exploit delivery via T1203 typically involves an outbound HTTP/S request to an attacker-controlled domain followed by a payload download — these flows are your primary forensic indicator if exploitation occurred before containment.
4
Step 4: Recovery — After fleet-wide update is confirmed, validate that EDR coverage is active on all endpoints where Firefox is deployed. Verify web content filtering and DNS-layer controls are tuned to block known malicious redirect chains consistent with T1203 browser exploit delivery. Apply least-privilege principles to browser process permissions where supported by your endpoint configuration. (Cite: NIST AC-6 — Least Privilege / CIS 4.5 — Implement and Manage a Firewall on End-User Devices / CIS 7.1 — Establish and Maintain a Vulnerability Management Process / D3-PBWSAM — Proxy-based Web Server Access Mediation / D3-UAP — User Account Permissions)
IR Detail
Detection & Analysis
NIST 800-61r3 §3.2 — Detection and Analysis: validating detection coverage and tuning controls to identify exploitation attempts against vulnerable Firefox versions
NIST SI-4 (System Monitoring)
NIST SI-3 (Malicious Code Protection)
NIST AU-2 (Event Logging)
NIST AU-6 (Audit Record Review, Analysis, and Reporting)
CIS 8.2 (Collect Audit Logs)
CIS 4.4 (Implement and Manage a Firewall on Servers)
CIS 4.5 (Implement and Manage a Firewall on End-User Devices)
Compensating Control
Without EDR, deploy Sysmon (free, Microsoft Sysinternals) with a configuration that captures Event ID 1 (Process Creation) filtering on `firefox.exe` as parent process spawning unexpected child processes (cmd.exe, powershell.exe, wscript.exe, mshta.exe) — this is the canonical post-exploitation signal for a successful browser RCE via T1203. Use the SwiftOnSecurity Sysmon config as a baseline and add a specific rule: `<ParentImage condition="contains">firefox.exe</ParentImage>`. For DNS-layer coverage without a commercial tool, configure Pi-hole with the URLhaus malicious domains list (updated daily via blocklist URL). For network-layer detection, write a Snort/Suricata rule matching HTTP responses containing known browser exploit kit URI patterns (e.g., heavily obfuscated JavaScript with `eval(unescape(` or `String.fromCharCode(` patterns in content). Reference Sigma rule `proc_creation_win_susp_browser_child_process.yml` from the SigmaHQ repository for SIEM-free log hunting via PowerShell: `Get-WinEvent -LogName Security | Where-Object {$_.Id -eq 4688 -and $_.Message -match 'firefox' -and $_.Message -match 'cmd.exe'}`.
Preserve Evidence
Query Windows Security Event Log for Event ID 4688 (Process Creation) filtering on processes with `firefox.exe` as the parent process — any child process spawn (especially cmd.exe, powershell.exe, rundll32.exe, or regsvr32.exe) is a high-fidelity indicator of successful RCE exploitation of one of MFSA2026-30's memory corruption or use-after-free vulnerabilities. Also collect: proxy/web filter logs for HTTP 302 redirect chains to domains not in Alexa/Cisco Umbrella top-1M (characteristic of exploit kit redirect chains preceding browser exploit delivery); DNS query logs for newly-registered domains queried from Firefox process context; and Firefox crash reports at `%APPDATA%\Mozilla\Firefox\Crash Reports\` — heap corruption exploits targeting browser memory vulnerabilities often generate minidump files (`.dmp`) before achieving stable code execution.
5
Step 5: Post-Incident — Monitor MFSA2026-30 and subsequent Firefox releases for staged CVE disclosure from the Mythos-assisted discovery pipeline. Update your software inventory to reflect Firefox 150 as the authorized baseline. Revisit browser patch SLA targets given accelerating AI-assisted vulnerability discovery velocity. Ensure audit log retention is sufficient to support post-incident review if exploitation occurred prior to patching. Brief stakeholders on patching timeline and adjust vulnerability management process documentation accordingly. (Cite: NIST AU-11 — Audit Record Retention / CIS 2.2 — Ensure Authorized Software is Currently Supported / CIS 7.1 — Establish and Maintain a Vulnerability Management Process / CIS 7.2 — Establish and Maintain a Remediation Process / AU-13 — Monitoring For Information Disclosure)
IR Detail
Post-Incident
NIST 800-61r3 §4 — Post-Incident Activity: integrating threat intelligence from this advisory cycle into ongoing detection and patch SLA processes
NIST SI-5 (Security Alerts, Advisories, and Directives)
NIST IR-5 (Incident Monitoring)
NIST RA-5 (Vulnerability Monitoring and Scanning)
CIS 7.1 (Establish and Maintain a Vulnerability Management Process)
CIS 7.2 (Establish and Maintain a Remediation Process)
Compensating Control
Subscribe to Mozilla's security advisories RSS feed at `https://www.mozilla.org/en-US/security/advisories/` and route new MFSA entries to a team Slack/Teams channel or shared email alias via an RSS-to-email bridge (free options: IFTTT, rss2email). Set a calendar reminder to check for Firefox 151+ release notes within 72 hours of each Mozilla release, specifically filtering advisory text for memory safety, use-after-free, or heap corruption language — the vulnerability classes most likely to carry RCE potential from the Mythos-identified backlog. Maintain a local tracking spreadsheet correlating MFSA ID, CVE (when assigned), CVSS, and patch deployment date to measure SLA compliance as the staged disclosure unfolds.
Preserve Evidence
Preserve the current MFSA2026-30 advisory text and any associated CVE records as they exist today — Mozilla sometimes amends severity ratings or adds CVE assignments after initial publication, and the original snapshot establishes your baseline risk acceptance decision. Also retain the Mythos/271-vulnerabilities disclosure source for your GRC team: if subsequent releases reveal that high-severity RCEs were among the staged findings, this documentation supports any regulatory notification timeline analysis (e.g., demonstrating reasonable response velocity relative to the disclosure timeline).
Recovery Guidance
After confirming Firefox 150 deployment across all endpoints, validate browser integrity by checking that no unauthorized extensions were silently installed during the exposure window — compare current extension inventory (`%APPDATA%\Mozilla\Firefox\Profiles\*.default\extensions.json`) against a known-good baseline, as browser RCE payloads frequently establish persistence via malicious extension injection or modification of Firefox user preferences (`user.js` or `prefs.js` in the profile directory). Monitor EDR and DNS telemetry for at least 14 days post-patch for delayed beacon activity, as exploit kit payloads delivered via T1203 browser exploitation sometimes include staged downloaders with delayed C2 check-in intervals designed to outlast short-window monitoring. If no EDR is present, run a weekly osquery sweep for the 30-day post-patch period querying for new browser extension installations and unexpected Firefox profile directory modifications.
Key Forensic Artifacts
Firefox crash reports and minidumps at %APPDATA%\Mozilla\Firefox\Crash Reports\submitted\ (Windows) or ~/Library/Application Support/Firefox/Crash Reports/ (macOS) — heap corruption and use-after-free exploits targeting the RCE-class vulnerabilities in MFSA2026-30 frequently generate .dmp files before achieving stable shellcode execution, providing evidence of exploit attempts even when exploitation failed
Firefox profile directory artifacts — specifically extensions.json, user.js, and prefs.js at %APPDATA%\Mozilla\Firefox\Profiles\<profile>\ — post-exploitation persistence via browser RCE commonly involves injecting a malicious extension or modifying security preferences (e.g., disabling certificate validation) to facilitate follow-on activity
Windows Security Event Log Event ID 4688 (Process Creation) and Sysmon Event ID 1 filtered for firefox.exe as ParentImage — successful RCE exploitation of a browser memory vulnerability via T1203 manifests as Firefox spawning cmd.exe, powershell.exe, rundll32.exe, or wscript.exe, which is anomalous and not produced by normal browser operation
Proxy and DNS logs covering the pre-patch exposure window — browser exploit kit delivery chains (the most common delivery mechanism for Firefox RCE exploitation) produce a characteristic pattern of HTTP 302 redirect hops through intermediary domains to the exploit host, followed by a payload download; filter proxy logs for requests with Referer chains exceeding 3 hops and DNS logs for queries to domains with registration age under 30 days from Firefox process context
Firefox HTTP cache and session restore files at %APPDATA%\Mozilla\Firefox\Profiles\<profile>\cache2\ and sessionstore-backups\ — these preserve the URL and content of pages visited during the exploitation window, enabling reconstruction of the malicious page or redirect chain that delivered the exploit payload, and are not cleared by a browser restart or update
Detection Guidance
No confirmed active exploitation of Firefox 150 vulnerabilities is documented at this time.
Detection should focus on behavioral patterns consistent with T1203 (Exploitation for Client Execution) and T1190 (Exploit Public-Facing Application), and on post-exploitation activity following a successful browser compromise.
Endpoint process telemetry (NIST AU-2 — Event Logging; NIST AU-3 — Content Of Audit Records): Alert on firefox.exe as a parent process spawning cmd.exe, powershell.exe, wscript.exe, or mshta.exe.
Under normal browser operation, these parent-child relationships do not occur. Capture full process command-line arguments in audit records to support triage.
File system activity (D3-SFA — System File Analysis): Monitor for unexpected writes to system directories, new executable drops, or modification of startup configuration files where firefox.exe or a child process is the source. D3-SICA (System Init Config Analysis) applies if persistence mechanisms are written to system initialization paths post-exploitation.
Network telemetry (NIST AU-6 — Audit Record Review, Analysis, And Reporting; D3-PBWSAM — Proxy-based Web Server Access Mediation; D3-EBWSAM — Endpoint-based Web Server Access Mediation): Monitor outbound connections from firefox.exe to newly registered domains, IP ranges with no prior organizational history, or non-standard ports. Browser exploit delivery chains frequently involve a redirect sequence terminating at a staging server. Proxy-based and endpoint-based web access mediation controls can interrupt this chain before payload delivery.
Audit log integrity and capacity (NIST AU-4 — Audit Storage Capacity; NIST AU-9 — Protection Of Audit Information; CIS 8.2 — Collect Audit Logs): Confirm audit logging is enabled across all endpoints running Firefox. Ensure storage capacity is allocated to retain logs per your retention policy (NIST AU-11 — Audit Record Retention) so that pre-patch activity is available for retrospective analysis if exploitation is later identified.
Account and privilege monitoring (D3-LAM — Local Account Monitoring; NIST AC-6 — Least Privilege): If post-exploitation activity is suspected, watch for new local account creation, privilege escalation attempts, or lateral movement originating from workstations where Firefox is deployed. Browser RCE chains frequently attempt privilege escalation as a second stage.
KB limitation note: The available D3FEND countermeasures in this KB do not include a process ancestry analysis or memory injection detection technique by ID. The process injection and cross-process memory write indicators described in the original guidance are operationally valid for T1203 detection; however, no matching D3FEND technique ID is available in the provided KB reference to cite for those specific behaviors. Treat those indicators as operationally grounded but not KB-cited.
Indicators of Compromise (1)
Export as
Splunk SPL
KQL
Elastic
Copy All (1)
1 url
Type Value Enrichment Context Conf.
🔗 URL
Pending — refer to Mozilla Security Advisory MFSA2026-30 for published indicators
VT
US
CVE identifiers, CWE mappings, and any associated technical indicators for the 41 vulnerabilities addressed in Firefox 150 are published at the Mozilla advisory; specific values were not available in the source data provided for this story.
LOW
Platform Playbooks
Microsoft Sentinel / Defender
CrowdStrike Falcon
AWS Security
🔒
Microsoft 365 E3
3 log sources
Basic identity + audit. No endpoint advanced hunting. Defender for Endpoint requires separate P1/P2 license.
🛡
Microsoft 365 E5
18 log sources
Full Defender suite: Endpoint P2, Identity, Office 365 P2, Cloud App Security. Advanced hunting across all workloads.
🔍
E5 + Sentinel
27 log sources
All E5 tables + SIEM data (CEF, Syslog, Windows Security Events, Threat Intelligence). Analytics rules, playbooks, workbooks.
IOC Detection Queries (1)
1 URL indicator(s).
KQL Query Preview
Read-only — detection query only
// Threat: Mozilla Firefox 150 Patches 41 Security Vulnerabilities Including High-Severity
let malicious_urls = dynamic(["Pending — refer to Mozilla Security Advisory MFSA2026-30 for published indicators"]);
DeviceNetworkEvents
| where Timestamp > ago(30d)
| where RemoteUrl has_any (malicious_urls)
| project Timestamp, DeviceName, RemoteUrl, RemoteIP,
InitiatingProcessFileName, InitiatingProcessCommandLine
| sort by Timestamp desc
MITRE ATT&CK Hunting Queries (1)
Sentinel rule: Web application exploit patterns
KQL Query Preview
Read-only — detection query only
CommonSecurityLog
| where TimeGenerated > ago(7d)
| where DeviceVendor has_any ("PaloAlto", "Fortinet", "F5", "Citrix")
| where Activity has_any ("attack", "exploit", "injection", "traversal", "overflow")
or RequestURL has_any ("../", "..\\\\", "<script", "UNION SELECT", "\${jndi:")
| project TimeGenerated, DeviceVendor, SourceIP, DestinationIP, RequestURL, Activity, LogSeverity
| sort by TimeGenerated desc
No actionable IOCs for CrowdStrike import (benign/contextual indicators excluded).
No hard IOCs available for AWS detection queries (contextual/benign indicators excluded).
Compliance Framework Mappings
CA-8
RA-5
SC-7
SI-2
SI-7
SI-3
+1
MITRE ATT&CK Mapping
T1190
Exploit Public-Facing Application
initial-access
T1203
Exploitation for Client Execution
execution
Guidance Disclaimer
