CVE-2025-55073
November 14, 2025
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.
Affected Packages
https://github.com/mattermost/mattermost-plugin-msteams.git (GITHUB):
Affected version(s) >=v0.0.1 <v2.2.2Fix Suggestion:
Update to version v2.2.2github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.4Fix Suggestion:
Update to version v10.11.4github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.12.0 <v10.12.1Fix Suggestion:
Update to version v10.12.1github.com/mattermost/mattermost-plugin-msteams (GO):
Affected version(s) >=v0.0.1 <v2.2.2Fix Suggestion:
Update to version v2.2.2github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.12Fix Suggestion:
Update to version v10.5.12github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250929212932-a41db04d2746Fix Suggestion:
Update to version v8.0.0-20250929212932-a41db04d2746Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Missing Authentication for Critical Function
EPSS
Base Score:
0.04
