CVE-2026-40872 | THREATINT

Description

mailcow: dockerized is an open source groupware/email suite based on docker. In versions prior to 2026-03b, the admin dashboard's Autodiscover logs render the EMailAddress value (logged as the "user" field) without HTML escaping. By submitting an unauthenticated Autodiscover request with a crafted EMailAddress containing HTML/JS, the payload is stored in Redis and executed when an admin views the Autodiscover logs. Version 2026-03b fixes the vulnerability.

PUBLISHED Reserved 2026-04-15 | Published 2026-04-21 | Updated 2026-04-22 | Assigner GitHub_M

CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N

Problem types

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

CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Product status

< 2026-03b

affected

References

github.com/...erized/security/advisories/GHSA-f9xf-vc72-rcgm exploit

github.com/...erized/security/advisories/GHSA-f9xf-vc72-rcgm

cve.org (CVE-2026-40872)

nvd.nist.gov (CVE-2026-40872)

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