CVE-2025-43921

Summary

CVE-2025-43921 is a vulnerability affecting GNU Mailman 2.1.39, as bundled in cPanel and WHM. This issue allows unauthenticated attackers to create mailing lists through the /mailman/create endpoint. Despite conflicting reports from multiple third parties, the vulnerability poses a potential risk to systems using the affected versions of Mailman, cPanel, or WHM. A successful exploit could lead to unauthorized mailing list creation, potentially resulting in unwanted emails or phishing attacks. System administrators are advised to update their Mailman installations to a patched version as soon as possible to mitigate this risk.

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