CVE-2026-40873

HIGH EPSS 24.3%

Published Apr 21, 20262mo ago · Modified Jun 17, 20261w ago

8.9 CVSS 4.0

High

Published Apr 21, 2026 2mo ago

Last Modified Jun 17, 2026 1w ago

Description

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the Quarantine details modal injects attachment filenames into HTML without escaping, allowing arbitrary HTML/JS execution. An attacker can deliver an email with a crafted attachment name so that when an admin views the quarantine item, JavaScript executes in their browser, taking over their account. Version 2026-03b fixes the vulnerability.

CVSS Details

Base Score

8.9

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/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

Privileges Required None

User Interaction P

Scope X

Threat Intelligence

EPSS Exploit Probability

24.3% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-79 Cross-site Scripting Injection

CWE-80

References 1

github.com https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-2xjc-rg88-jvpp

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.