GHSA-7gfc-8cq8-jh5f: Next.js authorization bypass vulnerability

Impact

If a Next.js application is performing authorization in middleware based on pathname, it was possible for this authorization to be bypassed for pages directly under the application’s root directory. For example:

• [Not affected] https://example.com/
• [Affected] https://example.com/foo
• [Not affected] https://example.com/foo/bar

Patches

This issue was patched in Next.js 14.2.15 and later.

If your Next.js application is hosted on Vercel, this vulnerability has been automatically mitigated, regardless of Next.js version.

Workarounds

There are no official workarounds for this vulnerability.

Credits

We’d like to thank tyage (GMO CyberSecurity by IERAE) for responsible disclosure of this issue.

References

• GHSA-7gfc-8cq8-jh5f
• vercel/next.js@1c8234e