Threats Tagged 'cve-2026-27977'
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Threats Tagged 'cve-2026-27977'
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CVE-2026-27977: CWE-1385: Missing Origin Validation in WebSockets in vercel next.jsCVE-2026-27977 0 CVE-2026-27977 is a low-severity vulnerability affecting development mode in Next.js versions 16.0.1 up to but not including 16.1.7. It involves missing origin validation in WebSocket connections used for Hot Module Replacement (HMR) during development. Specifically, the dev server's WebSocket endpoint could treat an 'Origin: null' header as a bypass, allowing attacker-controlled or sandboxed contexts to connect unexpectedly if the dev server is exposed to untrusted networks. This could enable an attacker to interact with development WebSocket traffic, potentially leaking sensitive information or manipulating the development environment. The issue is fixed in version 16. Join the discussion | CVE Database V5 | 03/17/2026, 23:56:24 UTC Added: 03/18/2026, 00:13:21 UTC |
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