CVE-2025-9078
September 15, 2025
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing
Affected Packages
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.9Fix Suggestion:
Update to version v10.5.9github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.8.0 <v10.8.4Fix Suggestion:
Update to version v10.8.4github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v9.11.0 <v9.11.18Fix Suggestion:
Update to version v9.11.18github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.9.0 <v10.9.4Fix Suggestion:
Update to version v10.9.4github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.9Fix Suggestion:
Update to version v10.5.9github.com/mattermost/mattermost (GO):
Affected version(s) >=v9.11.0 <v9.11.18Fix Suggestion:
Update to version v9.11.18github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.10.0 <v10.10.2Fix Suggestion:
Update to version v10.10.2github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.8.0 <v10.8.4Fix Suggestion:
Update to version v10.8.4github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.9.0 <v10.9.4Fix Suggestion:
Update to version v10.9.4github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.10.0 <v10.10.2Fix Suggestion:
Update to version v10.10.2github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250718075842-cd87e5c87737Fix Suggestion:
Update to version v8.0.0-20250718075842-cd87e5c87737Related Resources (7)
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
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Use of Weak Hash
EPSS
Base Score:
0.02
