CVE-2026-49243CWE-79cross-site-scripting

CVE-2026-49243

Critical · published September 29, 2026

CVSS v3.1
9.6
EPSS
0%
Percentile
21.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00297 · 21.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-29T19:17Z
References (4)
https://beaksec.github.io/posts/webmin-one-click-rce-via-xss · [email protected]https://github.com/webmin/webmin/commit/2d016751399ed0f4159e72a6cbcd63694a84dabf · [email protected]https://github.com/webmin/webmin/releases/tag/2.650 · [email protected]https://github.com/webmin/webmin/security/advisories/GHSA-hv4w-p8jq-2rp5 · [email protected]
EPSS history
Timeline
  • 01 OCT 03:47Z
    EPSS moved — → 0%
    epss
  • 29 SEP 14:57Z
    Webmin: Reflected XSS in the Configuration module
    cvelistv5