GHSA-f82v-jwr5-mffw
CRITICALAuthorization Bypass in Next.js Middleware
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
next📦next📦next📦nextReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
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_)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | next | ≥ 13.0.0&&< 13.5.9 | 13.5.9 |
| 📦npm | next | ≥ 14.0.0&&< 14.2.25 | 14.2.25 |
| 📦npm | next | ≥ 15.0.0&&< 15.2.3 | 15.2.3 |
| 📦npm | next | ≥ 12.0.0&&< 12.3.5 | 12.3.5 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Next.js Middleware 15.2.2 - Authorization Bypass
by kOaDT · Apr 5, 2025
Frequently Asked Questions
Is GHSA-f82v-jwr5-mffw in your stack?
O3 detects GHSA-f82v-jwr5-mffw across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.