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CVE-2025-3929

19
FAUCET Score

CVE-2025-3929 is a Cross-Site Scripting (XSS) vulnerability affecting MDaemon Email Server versions 25.0.1 and below. An attacker can exploit this by sending a specially crafted HTML email containing JavaScript within an img tag. This allows for arbitrary JavaScript execution in a webmail user's browser, potentially leading to unauthorized access to user data. The vulnerability has a CVSS score of 6.1 (Medium), indicating a network-based attack with low complexity, requiring user interaction, and resulting in low confidentiality and integrity impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 20.0.0, < 20.0.9CPE matchmatch criteria
cpe:2.3:a:mdaemon:email_server:*:*:*:*:*:*:*:*
>= 21.0.0, < 21.0.8CPE matchmatch criteria
cpe:2.3:a:mdaemon:email_server:*:*:*:*:*:*:*:*
>= 21.5.0, < 21.5.6CPE matchmatch criteria
cpe:2.3:a:mdaemon:email_server:*:*:*:*:*:*:*:*
>= 22.0.0, < 22.0.7CPE matchmatch criteria
cpe:2.3:a:mdaemon:email_server:*:*:*:*:*:*:*:*
>= 23.0.0, < 23.0.4CPE matchmatch criteria
cpe:2.3:a:mdaemon:email_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

5.3MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
LOW
SS Integrity
LOW
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
43.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 46th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

mdaemon.com / pages/downloads-critical-updates
Release Notes