CVE-2026-49102 Cross-site scripting in Webmin
An attacker can execute arbitrary scripts in the victim's browser by sending a malicious SVG email attachment viewed in Webmin's mailboxes component.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-49102?
CVE-2026-49102 is a medium-severity cross-site scripting vulnerability in Webmin, published on 27 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Webmin before 2.640 allows mailboxes/detach.cgi XSS via an SVG document attachment that is viewed in the mailboxes component, because image/svg+xml is used instead of a safe type (e.g., text/plain).
Weakness: CWE-79
Which versions are affected by CVE-2026-49102?
How do I fix CVE-2026-49102?
No fix has been published for CVE-2026-49102 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-49102 being exploited?
There is no known exploitation of CVE-2026-49102 in the wild and no public exploit code.
Sources
Also known as GHSA-2rpj-3356-c2rw.