{"id":"CVE-2021-37863","aliases":["BIT-mattermost-2021-37863","EUVD-2021-24341","GHSA-7523-wx28-g6xf"],"status":"published","title":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which...","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00863,"percentile":0.58894,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2021-12-17T16:10:30Z","modified":"2026-10-24T10:30:35Z","fixes":[{"ecosystem":"Bitnami","package":"mattermost","fixed_in":["6.0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mattermost","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.0.1"}]}]}],"products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","web","advisory"]},{"url":"https://hackerone.com/reports/1253732","tags":["x_refsource_MISC","x_transferred","Permissions Required","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37863","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7523-wx28-g6xf"}],"sources":{"cve":[{"id":"CVE-2021-37863","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2021-12-17T16:10:30Z","modified":"2024-08-04T01:30:08.631Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:58.359368Z"}],"euvd":[{"id":"EUVD-2021-24341","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2021-12-17T16:10:30Z","modified":"2024-08-04T01:30:08Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-03T03:24:26.118239Z"}],"ghsa":[{"id":"GHSA-7523-wx28-g6xf","title":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which...","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2021-12-18T00:00:48Z","modified":"2023-02-01T05:07:09Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:50:29.480738Z"}],"nvd":[{"id":"CVE-2021-37863","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2021-12-17T17:15:12.987Z","modified":"2026-06-17T04:01:13.063Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:07:02.566991Z"}],"osv":[{"id":"CVE-2021-37863","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2021-12-17T17:15:12.987Z","modified":"2026-10-24T10:30:35.114455854Z","cvss":[{"version":"3.1","score":5.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:20.434873Z"},{"id":"BIT-mattermost-2021-37863","description":"Mattermost 6.0 and earlier fails to sufficiently validate parameters during post creation, which allows authenticated attackers to cause a client-side crash of the web application via a maliciously crafted post.","status":"published","published":"2024-03-06T11:04:59.804Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"}]}}