CVE-2026-126780
Webmin through 2.670 Privilege Escalation via acl/save_group.cgi
Webmin through 2.670 contains a privilege escalation vulnerability in acl/save_group.cgi that allows delegated administrators to grant unauthorized modules by submitting arbitrary module lists in the mod parameter. Attackers with Webmin Users module access can create or edit groups holding modules like Command Shell and assign themselves membership to execute commands as root.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| webmin webmin webmin/webmin
github |
≥ 0; ≤ 2.670 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.6 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 7.2 high |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/webmin/webmin/commit/c861e308f4ee4cff1795ccc7621fc75623e1bb90CNA: VulnCheck · patch
- https://github.com/webmin/webmin/commit/be54ba38c3b86a3647a62327e1de81d5d0db098aCNA: VulnCheck · patch
- https://github.com/webmin/webmin/blob/2.670/acl/save_group.cgi#L83CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/webmin-through-2.670-privilege-escalation-via-acl-save-group-cgiCNA: VulnCheck · third-party-advisory
For agents and automation
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