{"id":"CVE-2023-43754","aliases":["EUVD-2023-2991","GHSA-jjr7-372r-cx7x"],"status":"published","title":"Permalink previews displayed for posts in archived channels even if users are disallowed to view archived channels","description":"Mattermost fails to check whether the  “Allow users to view archived channels”  setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00506,"percentile":0.43488,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2023-11-27T09:11:13Z","modified":"2026-10-28T02:30:24Z","fixes":[{"ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","fixed_in":["9.1.1","9.0.2","8.1.4"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","fixed_in":["7.8.13"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.1.0"},{"fixed":"9.1.1"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.0.2"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.1.4"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.8.13"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.1.0"},{"fixed":"9.1.1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"9.0.0"},{"fixed":"9.0.2"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.1.4"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.8.13"}]}]}],"products":[{"vendor":"mattermost","product":"mattermost"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["x_transferred","Vendor Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43754","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-jjr7-372r-cx7x"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43754.json","tags":["advisory"]},{"url":"https://github.com/mattermost/mattermost","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-43754","title":"Permalink previews displayed for posts in archived channels even if users are disallowed to view archived channels","description":"Mattermost fails to check whether the  “Allow users to view archived channels”  setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled. \n\n","status":"published","published":"2023-11-27T09:11:13.283Z","modified":"2024-08-02T19:52:11.105Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:35:14.633899Z"}],"euvd":[{"id":"EUVD-2023-2991","description":"Mattermost fails to check whether the  “Allow users to view archived channels”  setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled. \n\n","status":"published","published":"2023-11-27T09:11:13Z","modified":"2024-08-02T19:52:11Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T03:49:59.530903Z"}],"ghsa":[{"id":"GHSA-jjr7-372r-cx7x","title":"Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability","description":"Mattermost fails to check whether the \"Allow users to view archived channels\" setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the \"Allow users to view archived channels\" setting is disabled. \n\n","status":"published","published":"2023-11-27T12:30:54Z","modified":"2023-11-28T20:49:56Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:37:22.840002Z"}],"nvd":[{"id":"CVE-2023-43754","description":"Mattermost fails to check whether the  “Allow users to view archived channels”  setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled. \n\n","status":"published","published":"2023-11-27T10:15:07.657Z","modified":"2026-06-17T06:26:22.297Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:08:49.393375Z"}],"osv":[{"id":"CVE-2023-43754","title":"Permalink previews displayed for posts in archived channels even if users are disallowed to view archived channels","description":"Mattermost fails to check whether the  “Allow users to view archived channels”  setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the “Allow users to view archived channels” setting is disabled. \n\n","status":"published","published":"2023-11-27T09:11:13.283Z","modified":"2026-10-28T02:30:24.434045578Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"GHSA-jjr7-372r-cx7x","title":"Mattermost Exposure of Sensitive Information to an Unauthorized Actor vulnerability","description":"Mattermost fails to check whether the \"Allow users to view archived channels\" setting is enabled during permalink previews display, allowing members to view permalink previews of archived channels even if the \"Allow users to view archived channels\" setting is disabled. \n\n","status":"published","published":"2023-11-27T12:30:54Z","modified":"2026-09-10T03:49:47.665572563Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:46:50.687609Z"}]}}