{"cve":"CVE-2025-27936","nvd":{"published":"2025-04-16T10:15:14.797","modified":"2026-06-17T09:04:25.247","status":"Analyzed","description":"Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-208"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server","mattermost:ms_teams"],"source":"nvd","synced_at":"2026-10-19T22:01:11.054312287+00:00"},"epss":{"cve":"CVE-2025-27936","score":0.00345,"percentile":0.28069,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2j87-p623-8cc2","url":"https://osv.dev/vulnerability/GHSA-2j87-p623-8cc2","summary":"Mattermost vulnerable to Observable Timing Discrepancy","modified":"2026-09-10T03:50:56.933832550Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":[">=10.5.0 <10.5.2"],"fixed":["10.5.2"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250314142426-c049748b8863"],"fixed":["8.0.0-20250314142426-c049748b8863"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-plugin-msteams","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-msteams","ranges":["<2.1.0"],"fixed":["2.1.0"]}]},{"id":"GO-2025-3618","url":"https://osv.dev/vulnerability/GO-2025-3618","summary":"Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams","modified":"2026-02-04T03:57:14.305984Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-plugin-msteams","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-msteams","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.5.0+incompatible <10.5.2+incompatible"],"fixed":["10.5.2+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":["<8.0.0-20250218121836-2b5275d87136"],"fixed":["8.0.0-20250218121836-2b5275d87136"]}]}],"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."]}