CVE-2025-43921

5.3 mediumEPSS 0.5%

Medium (5.3) in gnu mailman. EPSS 0.5% chance of exploitation in the next 30 days.

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

CVSS 3.1

5.3 medium

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 41% of CVEs (scores of 2026-10-31)
CWE: CWE-863
Published: 2025-04-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

gnu:mailman

References

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

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