Cross-Site Scripting Vulnerability in Usermin by Webmin
CVE-2026-123622

5.1MEDIUM

Key Information:

Vendor

Webmin

Status
Usermin
Vendor
CVE Published:
6 November 2026

What is CVE-2026-123622?

Usermin version 2.570 and earlier is susceptible to a cross-site scripting (XSS) vulnerability due to improper handling of content types in the 'detach.cgi' script. This flaw permits attackers to execute arbitrary scripts by exploiting a crafted HTML attachment sent via email. If a victim clicks on a link that leads to the 'detach.cgi' page with a manipulated 'type' parameter set to 'text/html', the malicious script can run in the context of the victim's authenticated Usermin session, potentially compromising sensitive user data.

Affected Version(s)

usermin 0 <= 2.570

References

https://github.com/webmin/usermin/issues/142
issue-tracking
https://github.com/webmin/usermin
product
https://github.com/webmin/usermin/commit/c5c43b9ad04a6080...
patch

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

leediay153 from Viettel Post
Ilia Ross (iliaross)
.