CVE-2025-29927 EXPLOIT
9.1
CRITICAL · CVSS 3.1 · EPSS 99.2% (pctl 100)
Patch early
A public exploit exists.
Description
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 authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.
Scoring
| CVSS | 9.1 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| EPSS | 99.23% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-285 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2025-03-21 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| vercel | next.js |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Next.js Middleware 15.2.2 - Authorization Bypass | 2025-04-05 |
References
- https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2
- https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48
- https://github.com/vercel/next.js/releases/tag/v12.3.5
- https://github.com/vercel/next.js/releases/tag/v13.5.9
- https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
- http://www.openwall.com/lists/oss-security/2025/03/23/3
- http://www.openwall.com/lists/oss-security/2025/03/23/4
- https://security.netapp.com/advisory/ntap-20250328-0002/
→ the Explorer · watch your stack · NVD