CVE-2026-3112

Name: CVE-2026-3112
Creator: NVD / NIST
Published: 2026-03-26T17:16:42.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2026-3112 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562

Metrics

CVSS 3.1

4.9/10

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

EPSS Probability

0.42%

33.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 10.11.0, < 10.11.12
Mattermost	Mattermost Server	>= 11.2.0, < 11.2.4
Mattermost	Mattermost Server	>= 11.3.0, < 11.3.2
Mattermost	Mattermost Server	11.4.0

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Mar 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3112?

How severe is CVE-2026-3112?

CVE-2026-3112 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3112?

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-2026-3112?

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

Scan your code now

Source: NVD / NIST