CVE-2025-13352
December 17, 2025
Mattermost versions 10.11.x <= 10.11.6 and Mattermost GitHub plugin versions <=2.4.0 fail to validate plugin bot identity in reaction forwarding which allows attackers to hijack the GitHub reaction feature to make users add reactions to arbitrary GitHub objects via crafted notification posts.
Affected Packages
https://github.com/mattermost/mattermost-plugin-github.git (GITHUB):
Affected version(s) >=v0.0.1 <v2.5.0Fix Suggestion:
Update to version v2.5.0github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.0.0-alpha.1 <v11.1.0Fix Suggestion:
Update to version v11.1.0github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.7Fix Suggestion:
Update to version v10.11.7github.com/mattermost/mattermost-plugin-github (GO):
Affected version(s) >=v0.0.0-20250829075715-0deffcfc6bee <v1.0.1-0.20250829075715-0deffcfc6beeFix Suggestion:
Update to version v1.0.1-0.20250829075715-0deffcfc6beegithub.com/mattermost/mattermost-plugin-github (GO):
Affected version(s) >=v0.0.0-20250829075715-0deffcfc6bee <v1.0.1-0.20250829075715-0deffcfc6beeFix Suggestion:
Update to version v1.0.1-0.20250829075715-0deffcfc6beeRelated Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Validation of Specified Type of Input
EPSS
Base Score:
0.05
