CVE-2025-14822
January 16, 2026
Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens
Affected Packages
https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v9.0.0-rc1 <v11.2.0-rc3Fix Suggestion:
Update to version v11.2.0-rc3https://github.com/mattermost/mattermost.git (GITHUB):
Affected version(s) >=v10.11.0 <v10.11.9Fix Suggestion:
Update to version v10.11.9github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.9Fix Suggestion:
Update to version v10.11.9github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v11.0.1-rc1 <v11.2.0Fix Suggestion:
Update to version v11.2.0Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
0.02
