{"id":"CVE-2021-37864","aliases":["EUVD-2021-24342","GHSA-898c-6fq9-5cv9"],"status":"published","title":"Users can view the contents of an archived channel when access is explicitly denied by the system admin","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","severity":{"version":"3.1","score":2.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00585,"percentile":0.48238,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-284","CWE-863"],"published":"2022-01-18T16:52:19Z","modified":"2026-10-24T10:30:53Z","products":[{"vendor":"mattermost","product":"mattermost"}],"references":[{"url":"https://mattermost.com/security-updates/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37864"},{"url":"https://github.com/advisories/GHSA-898c-6fq9-5cv9"}],"sources":{"cve":[{"id":"CVE-2021-37864","title":"Users can view the contents of an archived channel when access is explicitly denied by the system admin","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","status":"published","published":"2022-01-18T16:52:19Z","modified":"2024-12-06T23:11:16.668Z","cvss":[{"version":"3.1","score":2.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:32:58.359368Z"}],"euvd":[{"id":"EUVD-2021-24342","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","status":"published","published":"2022-01-18T16:52:19Z","modified":"2024-12-06T23:11:16Z","cvss":[{"version":"3.1","score":2.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-03T00:04:38.652605Z"}],"ghsa":[{"id":"GHSA-898c-6fq9-5cv9","title":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived...","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","status":"published","published":"2022-01-19T00:01:11Z","modified":"2023-01-29T05:07:50Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:46:11.594724Z"}],"nvd":[{"id":"CVE-2021-37864","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","status":"published","published":"2022-01-18T17:15:08.4Z","modified":"2026-06-17T04:01:13.173Z","cvss":[{"version":"3.1","score":2.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-284","CWE-863"],"updated_at":"2026-11-02T14:07:03.821385Z"}],"osv":[{"id":"CVE-2021-37864","description":"Mattermost 6.1 and earlier fails to sufficiently validate permissions while viewing archived channels, which allows authenticated users to view contents of archived channels even when this is denied by system administrators by directly accessing the APIs.","status":"published","published":"2022-01-18T17:15:08.4Z","modified":"2026-10-24T10:30:53.026986801Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:20.434873Z"}]}}