CVE-2025-29927
Authorization Bypass in Next.js Middleware
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- Next.js Middleware 15.2.2 - Authorization Bypass2025-04-05 · webapps · multiple
Impact
# Impact It is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. # Patches * For Next.js 15.x, this issue is fixed in `15.2.3` * For Next.js 14.x, this issue is fixed in `14.2.25` * For Next.js 13.x, this issue is fixed in 13.5.9 * For Next.js 12.x, this issue is fixed in 12.3.5 * For Next.js 11.x, consult the below workaround. _Note: Next.js deployments hosted on Vercel are automatically protected against this vulnerability._ # Workaround If patching to a safe version is infeasible, we recommend that you prevent external user requests which contain the `x-middleware-subrequest` header from reaching your Next.js application. ## Credits - Allam Rachid (zhero;) - Allam Yasser (inzo_)
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | next | >= 13.0.0, < 13.5.9 | 13.5.9 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vercel | Next.Js | from 11.1.4 before 12.3.5 from 13.0.0 before 13.5.9 from 14.0.0 before 14.2.25 from 15.0.0 before 15.2.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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/
- https://github.com/advisories/GHSA-f82v-jwr5-mffw
- https://nvd.nist.gov/vuln/detail/CVE-2025-29927
- https://vercel.com/changelog/vercel-firewall-proactively-protects-against-vulnerability-with-middleware
- https://security.netapp.com/advisory/ntap-20250328-0002