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CVE-2025-3929 is a cross-site scripting vulnerability in MDaemon Email Server version 25.0.1 and earlier. The flaw can be triggered by sending a specially crafted HTML email containing JavaScript embedded in an img tag. When a victim opens the malicious message in the webmail interface, attacker-supplied script executes in the context of the authenticated user’s browser session. This is a webmail "half-click" style issue in which opening the email is sufficient to trigger script execution, enabling access to data available within the user’s webmail session.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An mDaemon webmail vulnerability cited as one of several flaws targeted by TA458 for espionage access.
A zero-day cross-site scripting vulnerability in mDaemon webmail/email server exploited by TA458 in half-click webmail attacks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.