CVE-2026-49243: Webmin: Reflected XSS in the Configuration module

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-29 · updated 2026-10-13
Weakness: CWE-79

Description

Webmin is a web-based system administration tool for Unix-like servers. Prior to version 2.650, Webmin users who click on a malicious link to their server are vulnerable to this XSS vulnerability that could be used to execute attacker-controlled commands. This issue has been patched in version 2.650.

Affected products

Webmin: before 2.650

References

https://beaksec.github.io/posts/webmin-one-click-rce-via-xss
https://github.com/webmin/webmin/commit/2d016751399ed0f4159e72a6cbcd63694a84dabf
https://github.com/webmin/webmin/releases/tag/2.650
https://github.com/webmin/webmin/security/advisories/GHSA-hv4w-p8jq-2rp5

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