Description
Webmin is a web-based system administration tool for Unix-like servers. Prior to 2.652, untrusted users with access to the File Manager or Upload and Download modules can direct Webmin's server-side URL download functionality to non-public network addresses because download destinations are not restricted by resolved IP address. This allows requests to unauthenticated intranet services or cloud-provider instance metadata endpoints that are inaccessible from the user's own system. This issue is fixed in 2.652.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| webmin | webmin | < 2.652 | — |
Advisories 1
- WID-SEC-2026-4355 Webmin: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Nov 4, 2026
References
- https://github.com/webmin/webmin/security/advisories/GHSA-x8qr-rx2g-f23g
- https://github.com/webmin/webmin/pull/2789
- https://github.com/webmin/webmin/commit/5b6b43ac3d09ff582c1fa89d9589324f02320c42
- https://github.com/webmin/webmin/commit/e805319233c5a6837e97b35a329c6bb2cad82657
- https://github.com/webmin/webmin/commit/f62fd9e23adc9dc7c65ff75b31d10ae3e7eadc90
- https://github.com/webmin/webmin/releases/tag/2.652