CVE-2025-3929: email server XSS (CVSS 6.1)

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.

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CVSS v3.1 Score

6.1

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
mdaemon	email_server	20.0.0 — 20.0.9
mdaemon	email_server	21.0.0 — 21.0.8
mdaemon	email_server	21.5.0 — 21.5.6
mdaemon	email_server	22.0.0 — 22.0.7
mdaemon	email_server	23.0.0 — 23.0.4
mdaemon	email_server	23.5.0 — 23.5.5
mdaemon	email_server	24.0.0 — 24.0.4
mdaemon	email_server	24.5.0 — 24.5.3
mdaemon	email_server	25.0.0 — 25.0.2

References

Other References

https://mdaemon.com/pages/downloads-critical-updates

Frequently Asked Questions

What is CVE-2025-3929? +

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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-3929? +

CVE-2025-3929 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-3929? +

CVE-2025-3929 affects products from mdaemon, specifically: email_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-3929? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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