Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server
Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server
02 / AFFECTED SOFTWARE
Affected packages
39 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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
Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server
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.
05 / REFERENCES
Further evidence
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54499.json
- https://mattermost.com/security-updates
- https://nvd.nist.gov/vuln/detail/CVE-2025-54499
- https://github.com/advisories/GHSA-xr3w-rmvj-f6m7
- https://github.com/mattermost/mattermost/commit/38208b8f065f0786eac0e968f9d754b91b62878c
- https://github.com/mattermost/mattermost/commit/97a4c7839cf5610cfe17c52042878aebb7678372
- https://github.com/mattermost/mattermost