What is CVE-2026-3108?

CVE-2026-3108 is a high-severity vulnerability in Mattermost, classified under CWE-150. CVSS score: 8.0/10. Published 2026-03-26.

How severe is CVE-2026-3108?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in Mattermost

CVE-2026-3108

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals…

EPSS: 0.000 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H.

Affected products

Mattermost — versions 11.2.0, 10.11.0, 11.4.0

Weakness classification (CWE)

CWE-150

References

MMSA-2026-00599 (vendor-advisory)

Frequently asked questions

What is CVE-2026-3108?: CVE-2026-3108 is a high-severity vulnerability in Mattermost, classified under CWE-150. CVSS score: 8.0/10. Published 2026-03-26.
How severe is CVE-2026-3108?: High severity. CVSS v3 base score is 8.0 out of 10.