Vulnerability details
CVE-2025-29927
vercel next.js
Authorization Bypass in Next.js Middleware
CVSS 3.1
9.1Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| vercel | next.js | >= 11.1.4, < 12.3.5 | CVEProject cvelistV5 (CNA) |
| vercel | next.js | >= 13.0.0, < 13.5.9 | CVEProject cvelistV5 (CNA) |
| vercel | next.js | >= 14.0.0, < 14.2.25 | CVEProject cvelistV5 (CNA) |
| vercel | next.js | >= 15.0.0, < 15.2.3 | CVEProject cvelistV5 (CNA) |
References and advisories
8- 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
- 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/
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Details
- Published
- 2025-03-21
- Last updated
- 2025-04-08
- State
- Published
- Assigner (CNA)
- GitHub_M
- Kolun priority
- 39 · Medium
Exploit prediction (EPSS)
99.22%
Probability of exploitation in 30 days
99.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-285Improper Authorization