CVE-2025-43921
MEDIUM
5.3
CVSS Score
Published: April 20, 2025 at 12:00 AM UTC
Updated: June 17, 2026 at 09:24 AM UTC
1 product affected across 1 vendorMailman
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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
PoC
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.
References (4)
SSVC — Action Prioritization
SSVCPoCAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.3MEDIUMmitre
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-863
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