{"cve":"CVE-2025-54499","nvd":{"published":"2025-10-16T09:15:34.507","modified":"2026-10-19T16:10:00.260","status":"Analyzed","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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","score":3.7},"cwes":["CWE-208"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T22:12:35.277909958+00:00"},"epss":{"cve":"CVE-2025-54499","score":0.00272,"percentile":0.19329,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-xr3w-rmvj-f6m7","url":"https://osv.dev/vulnerability/GHSA-xr3w-rmvj-f6m7","summary":"Mattermost has an Observable Timing Discrepancy vulnerability","modified":"2025-11-05T19:57:38.749472Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250728063359-38208b8f065f"],"fixed":["8.0.0-20250728063359-38208b8f065f"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.5.0 <10.5.11"],"fixed":["10.5.11"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.11.0 <10.11.3"],"fixed":["10.11.3"]}]},{"id":"GO-2025-4036","url":"https://osv.dev/vulnerability/GO-2025-4036","summary":"Mattermost has an Observable Timing Discrepancy vulnerability in github.com/mattermost/mattermost-server","modified":"2026-03-03T04:57:00.585185Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.5.0+incompatible <10.5.11+incompatible",">=10.11.0+incompatible <10.11.3+incompatible"],"fixed":["10.5.11+incompatible","10.11.3+incompatible"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250728063359-38208b8f065f"],"fixed":["8.0.0-20250728063359-38208b8f065f"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}