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CVE-2025-3929: Stored XSS vulnerability in MDaemon Email Server
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-04-29 · updated 2026-06-17
- Weakness: CWE-79
Description
An XSS issue was discovered in MDaemon Email Server version 25.0.1 and below. An attacker can send a specially crafted HTML e-mail message with JavaScript in an img tag. This could allow a remote attacker to load arbitrary JavaScript code in the context of a webmail user's browser window, and access user data.
Affected products
- MDaemon Email Server: from 20.0.0 before 20.0.9; from 21.0.0 before 21.0.8; from 21.5.0 before 21.5.6; from 22.0.0 before 22.0.7; from 23.0.0 before 23.0.4; from 23.5.0 before 23.5.5 — fixed in 20.0.9, 21.0.8, 21.5.6, 22.0.7, 23.0.4, 23.5.5
How to fix
Upgrade to a fixed version: MDaemon Email Server 20.0.9, 21.0.8, 21.5.6, 22.0.7. Check the vendor advisory for mitigations.
References
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