Résumé
Next.js: Unauthenticated disclosure of internal Server Function endpoints
Détails de l’avis
Impact
In Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used.
Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references).
Affected users are applications using App Router + Server Actions.
By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses.
Workarounds
Never assume any authentication claims at the use cache or use server boundary. Always authenticate within the boundary.
Références
- https://github.com/advisories/GHSA-955p-x3mx-jcvp
- https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp
- https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3
- https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b
- https://github.com/vercel/next.js/releases/tag/v15.5.21
- https://github.com/vercel/next.js/releases/tag/v16.2.11
Vulnérabilités liées
Tout Supply chain →- MEDIUMCVE-2026-63481
Hurl: Cookies in Cookies section leak when redirecting to a different host
- HIGHGHSA-vx52-2968-3vc6
pnpm: Environment secrets exfiltrated via env-placeholder expansion in proxy settings read from an untrusted pnpm-workspace.yaml
- HIGHCVE-2026-55553
urllib's cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage
- HIGHGHSA-mqq9-gxg5-m58g
Duplicate Advisory: Guzzle: URI fragments disclosed in redirect Referer headers
- HIGHGHSA-mjrx-74jh-7xgw
Duplicate Advisory: Guzzle: Host-only cookie scope is not preserved
- HIGHCVE-2026-67425
Flyto2 Core: LLM/API keys leak to an attacker-controlled base_url