Unauth List Creation in GNU Mailman 2.1.39 via /mailman/create (cPanel/WHM)
CVE-2025-43921 Published on April 20, 2025
GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-43921 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-43921
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Affected Versions
GNU Mailman Version 2.1.39 is affected by CVE-2025-43921Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.