Description
The account lockout functionality in (1) Webmin 1.140 and (2) Usermin 1.070 does not parse certain character strings, which allows remote attackers to conduct a brute force attack to guess user IDs and passwords.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 3.0 | webmin | 0.94-7woody2 | DSA-526 |
Advisories 1
- DSA-526 webmin - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 10474 vdb-entry
- DSA-526 vendor-advisory
- webmin-username-password-dos(16334) vdb-entry
- 10523 vdb-entry
- MDKSA-2004:074 vendor-advisory
- 20040611 [SNS Advisory No.75] Webmin/Usermin Account Lockout Bypass Vulnerability mailing-list
- GLSA-200406-15 vendor-advisory
- http://www.webmin.com/changes-1.150.html
- GLSA-200406-12 vendor-advisory
- http://www.lac.co.jp/security/csl/intelligence/SNSadvisory_e/75_e.html