Directory traversal vulnerability in Webmin before 1.280, when run on Windows, allows remote attackers to read arbitrary files via \ (backslash) characters in the URL to certain directories under the web root, such as the image directory.

Unknown vulnerability in Webmin 1.140 allows remote attackers to bypass access control rules and gain read access to configuration information for a module.

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.

An issue was discovered in Webmin 1.840 and 1.880 when the default Yes setting of "Can view any file as a log file" is enabled. As a result of weak default configuration settings, limited users have full access rights to the underlying Unix system files, allowing the user to read sensitive data from the local system (using Local File Include) such as the '/etc/shadow' file via a "GET /syslog/save_log.cgi?view=1&file=/etc/shadow" request.