Auth bypass in Vercel Next.js
CVE-2025-29927
Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the…
EPSS: 0.921 (99.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Vercel Next.js — versions >= 11.1.4, < 12.3.5, >= 14.0.0, < 14.2.25, >= 15.0.0, < 15.2.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw (x_refsource_CONFIRM)
- https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2 (x_refsource_MISC)
- https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48 (x_refsource_MISC)
- https://github.com/vercel/next.js/releases/tag/v12.3.5 (x_refsource_MISC)
- https://github.com/vercel/next.js/releases/tag/v13.5.9 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-29927?
- CVE-2025-29927 is a critical-severity vulnerability in Vercel Next.js, classified under Improper Authorization. CVSS score: 9.1/10. Published 2025-03-21.
- How severe is CVE-2025-29927?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2025-29927 known to be exploited?
- 771 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.