CVE-2025-6226
July 18, 2025
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
Affected Packages
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.7Fix Suggestion:
Update to version v10.5.7github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0+incompatible <v10.5.7Fix Suggestion:
Update to version v10.5.7github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.7.0 <v10.7.4Fix Suggestion:
Update to version v10.7.4github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250520130510-fa40a8c5d47fFix Suggestion:
Update to version v8.0.0-20250520130510-fa40a8c5d47fgithub.com/mattermost/mattermost (GO):
Affected version(s) >=v9.11.0+incompatible <v9.11.17Fix Suggestion:
Update to version v9.11.17github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.8.0 <v10.8.2Fix Suggestion:
Update to version v10.8.2github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.7.0+incompatible <v10.7.4Fix Suggestion:
Update to version v10.7.4github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v9.11.0 <v9.11.17Fix Suggestion:
Update to version v9.11.17github.com/mattermost/mattermost (GO):
Affected version(s) =v10.8.0+incompatible <v10.8.2Fix Suggestion:
Update to version v10.8.2Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Missing Authentication for Critical Function
EPSS
Base Score:
0.05
