CRITICAL 9.1 npm
Authorization Bypass in Next.js Middleware
GHSA-f82v-jwr5-mffw · CVE-2025-29927
Published · Modified
Description
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_)
References
- WEB https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-29927
- WEB https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2
- WEB https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48
- PACKAGE https://github.com/vercel/next.js
- WEB https://github.com/vercel/next.js/releases/tag/v12.3.5
- WEB https://github.com/vercel/next.js/releases/tag/v13.5.9
- WEB https://security.netapp.com/advisory/ntap-20250328-0002
- WEB https://vercel.com/changelog/vercel-firewall-proactively-protects-against-vulnerability-with-middleware
- WEB http://www.openwall.com/lists/oss-security/2025/03/23/3
- WEB http://www.openwall.com/lists/oss-security/2025/03/23/4
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