CVE-2025-54499
October 16, 2025
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to use constant-time comparison for sensitive string comparisons which allows attackers to exploit timing oracles to perform byte-by-byte brute force attacks via response time analysis on Cloud API keys and OAuth client secrets
Affected Packages
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.3Fix Suggestion:
Update to version v10.11.3github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.2Fix Suggestion:
Update to version v10.11.2github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250728063359-38208b8f065fFix Suggestion:
Update to version v8.0.0-20250728063359-38208b8f065fgithub.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250728063359-38208b8f065fFix Suggestion:
Update to version v8.0.0-20250728063359-38208b8f065fgithub.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.3Fix Suggestion:
Update to version v10.11.3github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.2Fix Suggestion:
Update to version v10.11.2github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11Related Resources (6)
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
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:
3.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Observable Timing Discrepancy
EPSS
Base Score:
0.05
