{"cve":"CVE-2025-6226","nvd":{"published":"2025-07-18T09:15:26.993","modified":"2026-06-17T10:01:25.027","status":"Analyzed","description":"Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-306"],"references":["https://mattermost.com/security-updates"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T22:05:46.678065081+00:00"},"epss":{"cve":"CVE-2025-6226","score":0.00371,"percentile":0.31069,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7h34-9chr-58qh","url":"https://osv.dev/vulnerability/GHSA-7h34-9chr-58qh","summary":"Mattermost Missing Authentication for Critical Function","modified":"2025-07-29T19:44:30.412600Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.5.0 <10.5.7"],"fixed":["10.5.7"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.8.0 <10.8.2"],"fixed":["10.8.2"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=10.7.0 <10.7.4"],"fixed":["10.7.4"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=9.11.0 <9.11.17"],"fixed":["9.11.17"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250520130510-fa40a8c5d47f"],"fixed":["8.0.0-20250520130510-fa40a8c5d47f"]}]},{"id":"GO-2025-3819","url":"https://osv.dev/vulnerability/GO-2025-3819","summary":"Mattermost Missing Authentication for Critical Function in github.com/mattermost/mattermost-server","modified":"2026-03-03T04:56:44.224127Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":[">=9.11.0+incompatible <9.11.17+incompatible",">=10.5.0+incompatible <10.5.7+incompatible",">=10.7.0+incompatible <10.7.4+incompatible",">=10.8.0+incompatible <10.8.2+incompatible"],"fixed":["9.11.17+incompatible","10.5.7+incompatible","10.7.4+incompatible","10.8.2+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":["<8.0.0-20250520130510-fa40a8c5d47f"],"fixed":["8.0.0-20250520130510-fa40a8c5d47f"]}]}],"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."]}