CVE-2025-55073 MEDIUM

CVE-2025-55073: MS Teams plugin OAuth allows editing arbitrary posts

Vendor Mattermost
Product Mattermost
Weakness CWE-306 · Missing auth
Published November 14, 2025
Last update November 14, 2025
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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 MSTeams plugin OAuth redirect URL.

Key dates

02Disclosure timeline

November 14, 2025 CVE published
November 14, 2025 Record updated