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Vulnerability record · CVE-2025-43921 · published 20 April 2025

CVE-2025-43921: Gnu mailman incorrect authorization vulnerability

Gnu · Mailman

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.

5.3 CVSS 3.1 Medium EPSS 0.45% · top 63.3% CWE-863 · Incorrect authorization
5.3CVSS 3.1 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://code.launchpad.net/~mailman-coders/mailman/2.1 Product
https://github.com/0NYX-MY7H/CVE-2025-43921 ExploitThird Party Advisory
https://github.com/cpanel/mailman2-python3
https://www.openwall.com/lists/oss-security/2025/04/21/6

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-43921), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.