CVE-2022-31138

Name: CVE-2022-31138
Creator: NVD / NIST
Published: 2022-07-11T14:15:08.427+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.34%

Last modified Jun 17, 2026

CVE-2022-31138 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 2.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.34%

81.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Mailcow	Mailcow\	< 2022-06a

References

https://github.com/ly1g3/Mailcow-CVE-2022-31138Exploit, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/commit/d373164e13a14e058f82c9f1918a5612f375a9f9Patch, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/releases/tag/2022-06aRelease Notes, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-vx9w-h33p-5vhcMitigation, Third Party Advisory
https://github.com/ly1g3/Mailcow-CVE-2022-31138Exploit, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/commit/d373164e13a14e058f82c9f1918a5612f375a9f9Patch, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/releases/tag/2022-06aRelease Notes, Third Party Advisory
https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-vx9w-h33p-5vhcMitigation, Third Party Advisory

Timeline

Published: Jul 11, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-31138?

How severe is CVE-2022-31138?

CVE-2022-31138 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.34% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31138?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-31138?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST