Stored XSS in MDaemon

1) Cross-site scripting

EUVDB-ID: #VU109215

Risk: High

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-3929

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data when handling IMG tag inside email messages. A remote attacker can trick the victim into opening a specially crafted email message and execute arbitrary JavaScript code in user's browser in context of vulnerable website.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

MDaemon: 20.0.0 - 25.0.1

CPE2.3

• cpe:2.3:a:alt-n:mdaemon:20.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:alt-n:mdaemon:20.0.9:*:*:*:*:*:*:*

External links

https://mdaemon.com/pages/downloads-critical-updates
https://files.mdaemon.com/mdaemon/release/RelNotes_en.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.