CVE-2026-49103 Path traversal in Webmin
An attacker can exploit unsafe filename construction in Webmin's mailboxes component to read or modify arbitrary files via path traversal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49103?
CVE-2026-49103 is a critical path traversal vulnerability in Webmin, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Webmin before 2.640 does not safely construct a filename for saving of an attachment within the mailboxes component. This occurs in mailboxes/detachall.cgi.
Weakness: CWE-24
Which versions are affected by CVE-2026-49103?
How do I fix CVE-2026-49103?
No fix has been published for CVE-2026-49103 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-49103 being exploited?
There is no known exploitation of CVE-2026-49103 in the wild and no public exploit code.
Sources
Also known as GHSA-6m8g-7xrr-8q5f.