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CVE-2025-43921

Date: April 19, 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.

Severity Score

Related Resources (6)

https://code.launchpad.net/~mailman-coders/mailman/2.1
https://nvd.nist.gov/vuln/detail/CVE-2025-43921
https://www.openwall.com/lists/oss-security/2025/04/21/6
https://github.com/cpanel/mailman2-python3
https://github.com/0NYX-MY7H/CVE-2025-43921
https://www.mend.io/vulnerability-database/CVE-2025-43921

Severity Score

Weakness Type (CWE)

Incorrect Authorization

CWE-863

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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