{"cve":"CVE-2025-11776","nvd":{"published":"2025-11-14T08:15:43.753","modified":"2026-10-19T13:10:00.110","status":"Analyzed","description":"Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` 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-2025-11776","score":0.00208,"percentile":0.10795,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-j6gg-r5jc-47cm","url":"https://osv.dev/vulnerability/GHSA-j6gg-r5jc-47cm","summary":"Mattermost fails to properly restrict access to archived channel search API","modified":"2025-11-17T19:58:46.484873Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","ranges":["<8.0.0-20250815165020-c8d66301415d"],"fixed":["8.0.0-20250815165020-c8d66301415d"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost","purl":"pkg:golang/github.com/mattermost/mattermost","ranges":["<5.3.2-0.20250815165020-c8d66301415d"],"fixed":["5.3.2-0.20250815165020-c8d66301415d"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","ranges":["<5.3.2-0.20250815165020-c8d66301415d"],"fixed":["5.3.2-0.20250815165020-c8d66301415d"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","ranges":["<5.3.2-0.20250815165020-c8d66301415d"],"fixed":["5.3.2-0.20250815165020-c8d66301415d"]},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":["<5.3.2-0.20250815165020-c8d66301415d"],"fixed":["5.3.2-0.20250815165020-c8d66301415d"]}]},{"id":"GO-2025-4126","url":"https://osv.dev/vulnerability/GO-2025-4126","summary":"Mattermost fails to properly restrict access to archived channel search API in github.com/mattermost/mattermost","modified":"2026-03-03T04:57:37.411534Z","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":["all versions"],"fixed":[]},{"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":["<8.0.0-20250815165020-c8d66301415d"],"fixed":["8.0.0-20250815165020-c8d66301415d"]}]}],"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."]}