CVE-2026-49103: Webmin

Critical severity, CVSS 9.4. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Webmin Webmin: before 2.640 (fixed in 2.640)

Published 2026-05-27. Last modified 2026-06-17.