CVE-2026-124552

CSRF exists in Webmin 1.850, allowing an attacker to execute arbitrary commands by sending a GET request to at/create_job.cgi with dir=/&cmd= in the URI.

There is an SSRF vulnerability in Webmin 1.850 that allows an attacker to exploit the PATH_INFO parameter to make a GET request to tunnel/link.cgi with an external IP address.

Webmin before version 2.650 contains an XSS vulnerability that can be exploited when a user clicks a malicious link to their server. An attacker can execute arbitrary commands in the user's context.

In Webmin prior to 2.652, untrusted users with access to the File Manager or Upload and Download modules can direct Webmin's server-side URL download functionality to non-public network addresses because download destinations are not restricted by resolved IP address. This allows requests to unauthenticated intranet services or cloud-provider instance metadata endpoints inaccessible from the user's own system.

Webmin is a web-based system administration tool for Unix-like servers. Prior to version 2.640, for Webmin accounts requiring a second authentication factor (typically TOTP), an attacker with knowledge of the username and password can bypass the 2FA requirement by using Basic authentication. As a workaround, apply the patch from commit da18a16c84ae5c0b78cad79609cb0efb174000ec manually.

Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.

Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.

The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. An attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.202.

Webmin before 2.641 contains a stored cross-site scripting vulnerability in the email template description field of the System and Server Status module. Low-privileged authenticated attackers can execute arbitrary JavaScript in the browser context of administrators by injecting unsanitized input stored in save_tmpl.cgi and rendered unescaped in list_tmpls.cgi.