CVE-2025-55073 - CVE House
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Status published Medium CVE-2025-55073

MS Teams plugin OAuth allows editing arbitrary posts

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Juho Forsén

References

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Affected Vendor

Affected Software

Mattermost
Vulnerable Versions:
10.11.0, 10.5.0, 10.12.0, 11.0.0, 10.11.4, 10.5.12, 10.12.1

Timeline

Official Publish: November 14th, 2025
Last Modified: November 14th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Weaknesses (CWE)

CWE-306

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1078 Valid Accounts
Persistence
T1136 Create Account
Persistence
T1098 Account Manipulation
Privilege Escalation
T1021 Remote Services
Lateral Movement