What is CVE-2025-55073?

CVE-2025-55073 is a medium-severity vulnerability in Mattermost, classified under Missing Authentication for Critical Function. CVSS score: 5.4/10. Published 2025-11-14.

How severe is CVE-2025-55073?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Mattermost

CVE-2025-55073

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted…

Vulnerability class: Broken Authentication

EPSS: 0.002 (5.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Mattermost — versions 10.11.0, 10.5.0, 10.12.0
Mattermost Mattermost_server

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

responsibledisclosure@mattermost.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-55073?: CVE-2025-55073 is a medium-severity vulnerability in Mattermost, classified under Missing Authentication for Critical Function. CVSS score: 5.4/10. Published 2025-11-14.
How severe is CVE-2025-55073?: Medium severity. CVSS v3 base score is 5.4 out of 10.