CVE-2024-31204: mailcow: dockerized is an open source groupware/email suite based on docker

Q: How do I fix CVE-2024-31204?

mailcow\: upgrade to 2024-04. Exact commands for each OS are on this page.

Q: Is CVE-2024-31204 being exploited?

CVE-2024-31204 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-31204 affect?

CVE-2024-31204 affects mailcow\. Severity is medium (CVSS 6.1). mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been identified in mailcow affecting versions prior to 2024-04. This vulnerability resides in the exception handling mechanism, specif

Q: How urgent is CVE-2024-31204?

Priority 55/100. EPSS top 5%: very likely to be exploited; Public exploit reference; On your watchlist

This month

MEDIUM 6.1WATCHLISTUPGRADE

CVE-2024-31204 is a medium-severity flaw (CVSS 6.1) affecting mailcow\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been identified in mailcow affecting versions prior to 2024-04. This vulnerability resides in the exception handling mechanism, specifically when not operating in DEV_MODE. The system saves exception details into a session array without proper sanitization or encoding. These details are later rendered into HTML and executed in a JavaScript bl

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	8.2% (top 5%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-04-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mailcow

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-04 21:15 UTCPublished CVE record published
2026-06-17 07:27 UTCUpdated Record last modified

mailcow mailcow\ UPGRADE

Affected: < 2024-04

Fixed in: 2024-04

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mailcow || rpm -q mailcow || mailcow --version

2. UPGRADE to 2024-04 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mailcow

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailcow

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-31204?

mailcow\: upgrade to 2024-04. Exact commands for each OS are on this page.

Is CVE-2024-31204 being exploited?

CVE-2024-31204 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-31204 affect?

CVE-2024-31204 affects mailcow\. Severity is medium (CVSS 6.1). mailcow: dockerized is an open source groupware/email suite based on docker. A security vulnerability has been identified in mailcow affecting versions prior to 2024-04. This vulnerability resides in the exception handling mechanism, specif

How urgent is CVE-2024-31204?

Priority 55/100. EPSS top 5%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

Docker vulnerabilities

Related CVEs

CVE-2025-53909 CRITICAL 9.1 UPGRADE mailcow: dockerized is an open source groupware/email suite based on docker
CVE-2025-25198 HIGH 7.1 UPGRADE mailcow: dockerized is an open source groupware/email suite based on docker
CVE-2024-41960 LOW 3.8 UPGRADE mailcow: dockerized is an open source groupware/email suite based on docker
CVE-2024-41959 HIGH 7.6 UPGRADE mailcow: dockerized is an open source groupware/email suite based on docker
CVE-2024-41958 MEDIUM 6.6 UPGRADE mailcow: dockerized is an open source groupware/email suite based on docker

References

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