{"cve":"CVE-2025-11777","nvd":{"published":"2025-11-13T18:15:49.393","modified":"2026-10-19T13:10:00.110","status":"Analyzed","description":"Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-863"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T22:16:02.354564667+00:00"},"epss":{"cve":"CVE-2025-11777","score":0.00196,"percentile":0.0922,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-mqcj-8c2g-h97q","url":"https://osv.dev/vulnerability/GHSA-mqcj-8c2g-h97q","summary":"Mattermost Incorrect Authorization vulnerability","modified":"2025-11-17T19:58:25.974125Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.11.0 <10.11.4"],"fixed":["10.11.4"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.5.0 <10.5.12"],"fixed":["10.5.12"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250905150616-ba86dfc5876b"],"fixed":["8.0.0-20250905150616-ba86dfc5876b"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","ranges":["<5.3.2-0.20250905150616-ba86dfc5876b"],"fixed":["5.3.2-0.20250905150616-ba86dfc5876b"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<5.3.2-0.20250905150616-ba86dfc5876b"],"fixed":["5.3.2-0.20250905150616-ba86dfc5876b"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","ranges":["<5.3.2-0.20250905150616-ba86dfc5876b"],"fixed":["5.3.2-0.20250905150616-ba86dfc5876b"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["<5.3.2-0.20250905150616-ba86dfc5876b"],"fixed":["5.3.2-0.20250905150616-ba86dfc5876b"]}]},{"id":"GO-2025-4122","url":"https://osv.dev/vulnerability/GO-2025-4122","summary":"Mattermost Incorrect Authorization vulnerability in github.com/mattermost/mattermost","modified":"2026-03-03T04:57:37.136860Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/v5","purl":"pkg:golang/github.com/mattermost/mattermost/v5","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 <10.5.12+incompatible",">=10.11.0+incompatible <10.11.4+incompatible"],"fixed":["10.5.12+incompatible","10.11.4+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":["<8.0.0-20251212204551-54f2e9b4afd5"],"fixed":["8.0.0-20251212204551-54f2e9b4afd5"]}]}],"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."]}