{"id":"CVE-2025-27936","aliases":["EUVD-2025-11359","GHSA-2j87-p623-8cc2","GO-2025-3618","openSUSE-SU-2025:15017-1"],"status":"published","title":"Webhook Secret Exposure via Timing attack in MSteams plugin","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00352,"percentile":0.29225,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-208"],"published":"2025-04-16T09:14:55Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","fixed_in":["10.5.2","8.0.0-20250314142426-c049748b8863","8.0.0-20250218121836-2b5275d87136"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/mattermost/mattermost-plugin-msteams","fixed_in":["2.1.0"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/mattermost/mattermost-server","fixed_in":["10.5.2+incompatible"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.5.0"},{"fixed":"10.5.2"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost-plugin-msteams","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.15.0"},{"fixed":"2.1.0"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.0-20250314142426-c049748b8863"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"10.5.0"},{"fixed":"10.5.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20250314142426-c049748b8863"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-plugin-msteams","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.1.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-plugin-msteams","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"introduced":"10.5.0+incompatible"},{"fixed":"10.5.2+incompatible"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20250218121836-2b5275d87136"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20250422T181640-1.1"}]}],"bundled":23}],"products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"},{"vendor":"mattermost","product":"ms_teams"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27936","tags":["advisory"]},{"url":"https://pkg.go.dev/vuln/GO-2025-3618","tags":["web"]},{"url":"https://github.com/advisories/GHSA-2j87-p623-8cc2","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27936.json","tags":["advisory"]},{"url":"https://github.com/mattermost/mattermost","tags":["package"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/XCF7AZBKQYAQXK32J6F54H6NREFBK2V7/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2019-15119","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-1386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-2424","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-24358","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-2475","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-24839","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-24866","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-2564","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-27538","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-27571","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-27936","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-30206","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-31363","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-32093","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-32431","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-32445","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-32793","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-32963","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-3801","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-43970","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-43971","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-43972","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-43973","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2025-27936","title":"Webhook Secret Exposure via Timing attack in MSteams plugin","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T09:14:55.095Z","modified":"2025-04-16T14:32:45.176Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:32:42.078906Z"}],"euvd":[{"id":"EUVD-2025-11359","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T09:14:55Z","modified":"2025-04-16T14:32:45Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T20:52:25.86191Z"}],"ghsa":[{"id":"GHSA-2j87-p623-8cc2","title":"Mattermost vulnerable to Observable Timing Discrepancy","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T12:31:19Z","modified":"2025-04-23T15:18:39Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:38:40.628275Z"}],"nvd":[{"id":"CVE-2025-27936","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T10:15:14.797Z","modified":"2026-06-17T09:04:25.247Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:11:00.456643Z"}],"osv":[{"id":"CVE-2025-27936","title":"Webhook Secret Exposure via Timing attack in MSteams plugin","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T09:14:55.095Z","modified":"2026-10-28T02:30:57.19759069Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:44:47.708311Z"},{"id":"GHSA-2j87-p623-8cc2","title":"Mattermost vulnerable to Observable Timing Discrepancy","description":"Mattermost Plugin MSTeams versions \u003c2.1.0 and Mattermost Server versions 10.5.x \u003c=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.","status":"published","published":"2025-04-16T12:31:19Z","modified":"2026-09-10T03:50:56.93383255Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:46:34.338541Z"},{"id":"GO-2025-3618","title":"Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams","description":"Mattermost vulnerable to Observable Timing Discrepancy in github.com/mattermost/mattermost-plugin-msteams.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/mattermost/mattermost-plugin-msteams before v2.1.0.","status":"published","published":"2025-04-22T16:56:33Z","modified":"2026-02-04T03:57:14.305984Z","updated_at":"2026-11-02T15:47:01.728182Z"},{"id":"openSUSE-SU-2025:15017-1","title":"govulncheck-vulndb-0.0.20250422T181640-1.1 on GA media","description":"These are all security issues fixed in the govulncheck-vulndb-0.0.20250422T181640-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-04-23T00:00:00Z","modified":"2026-02-04T02:34:16.37387Z","updated_at":"2026-11-02T16:58:37.399567Z"}]}}