CVE-2025-55073

MS Teams plugin OAuth allows editing arbitrary posts

State: Published
Severity: 5.4 Medium
Published: Nov 14, 2025
Updated: Nov 14, 2025
Reserved: Oct 15, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	Mattermost

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
MattermostMattermost	10.11.0 through 10.11.3Affected 10.5.0 through 10.5.11Affected 10.12.0 through 10.12.0Affected 11.0.0Not affected 10.11.4Not affected 10.5.12Not affected 10.12.1Not affected

References

https://mattermost.com/security-updates

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