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
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-xr3w-rmvj-f6m7 Mattermost has an Observable Timing Discrepancy vulnerability
Fixes

Solution

Update Mattermost to versions 10.12.0, 10.5.11, 10.11.3 or higher.


Workaround

No workaround given by the vendor.

References
History

Tue, 21 Oct 2025 18:00:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Mon, 20 Oct 2025 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Thu, 16 Oct 2025 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 16 Oct 2025 08:30:00 +0000

Type Values Removed Values Added
Description 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
Title Insecure string comparison enables timing attacks
Weaknesses CWE-208
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-10-16T13:51:10.320Z

Reserved: 2025-09-16T08:32:57.368Z

Link: CVE-2025-54499

cve-icon Vulnrichment

Updated: 2025-10-16T13:50:02.665Z

cve-icon NVD

Status : Analyzed

Published: 2025-10-16T09:15:34.507

Modified: 2025-10-21T17:58:02.190

Link: CVE-2025-54499

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-10-20T13:25:18Z