CVE-2026-123621 Usermin through 2.570 Path Traversal File Write via detachall.cgi
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123621?
CVE-2026-123621 is a high-severity vulnerability in webmin usermin, published on 6 Nov 2026.
Official description
Usermin through 2.570 contains a path traversal vulnerability in mailbox/detachall.cgi that allows remote unauthenticated attackers to write files outside the temporary directory via unsanitized attachment filenames. Attackers can email attachments with ../ sequences in filenames, and when the recipient downloads all attachments, files like ~/.forward are overwritten, enabling command execution.
Weakness: CWE-22
Which versions are affected by CVE-2026-123621?
How do I fix CVE-2026-123621?
No fix has been published for CVE-2026-123621 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123621 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123621 exists.
Sources
Also known as GHSA-6rhc-3jj8-rcqx.