CVE-2025-3929 Stored XSS vulnerability in MDaemon Email Server
Remote attackers can execute arbitrary JavaScript in webmail users' browsers via crafted HTML emails, potentially accessing user data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-3929?
CVE-2025-3929 is a medium-severity cross-site scripting vulnerability in MDaemon Email Server, published on 29 Apr 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-3929?
It affects 1 product.
Products include Mdaemon Email Server.
How do I fix CVE-2025-3929?
No fix has been published for CVE-2025-3929 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-3929 being exploited?
There is no known exploitation of CVE-2025-3929 in the wild and no public exploit code.
Sources
Also known as GHSA-jgvv-fw39-8435.