What is CVE-2026-1046?

CVE-2026-1046 is a high-severity vulnerability in Mattermost, classified under CWE-939. CVSS score: 7.6/10. Published 2026-02-16.

How severe is CVE-2026-1046?

High severity. CVSS v3 base score is 7.6 out of 10.

Vulnerability in Mattermost

CVE-2026-1046

Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Matterm…

EPSS: 0.000 (14.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L.

Affected products

Mattermost — versions 0, 6.1.0, 6.0.3.0

Weakness classification (CWE)

CWE-939

References

MMSA-2026-00577 (vendor-advisory)

Frequently asked questions

What is CVE-2026-1046?: CVE-2026-1046 is a high-severity vulnerability in Mattermost, classified under CWE-939. CVSS score: 7.6/10. Published 2026-02-16.
How severe is CVE-2026-1046?: High severity. CVSS v3 base score is 7.6 out of 10.