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CVE-2026-27971 is a CVSS 9.8 unauthenticated remote code execution vulnerability in the Qwik JavaScript framework’s server$ RPC mechanism, affecting all versions through 1.19.0; CISA KEV and VulnCheck KEV both confirm active exploitation. A single unauthenticated HTTP request is sufficient to achieve full server compromise on any Node.js-hosted Qwik SSR deployment. Patch to version 1.19.1 via npm immediately, place WAF rules blocking server$ RPC endpoint POST requests as interim mitigation, and monitor EDR for Node.js spawning unexpected shell interpreters.

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Tech Jacks Solutions