{"id":"CVE-2021-37863","details":"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.","aliases":["BIT-mattermost-2021-37863"],"modified":"2026-07-09T05:44:40.070794Z","published":"2021-12-17T17:15:12.987Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"},{"type":"REPORT","url":"https://hackerone.com/reports/1253732"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost","events":[{"introduced":"0"},{"last_affected":"c9b959e58a660fbc928dd91b062d7bcbb5657017"}],"database_specific":{"cpe":"cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"6.0"}],"source":"CPE_RANGE"}}],"versions":["v6.0.0","cloud-2021-08-12-1","cloud-2021-07-29-1","cloud-2021-07-15-1","cloud-2021-07-01-1","cloud-2021-06-16-1","cloud-2021-06-02-1","cloud-2021-05-21-1","cloud-2021-05-05-1","cloud-2021-04-22-1","cloud-2021-03-23-1","cloud-2021-03-12-1","cloud-2021-02-25-1","cloud-2021-02-24","cloud-2021-02-10","cloud-2021-01-26","cloud-2021-01-12","cloud-2020-12-18","cloud-2020-12-08","cloud-2020-11-24","v5.2.0-rc2","v5.2.0-rc1","v5.1.0-rc1","v5.0.0-rc1","v4.10.0-rc1","v4.9.0-rc1","v4.8.0-rc1","v4.7.0-rc1","v4.6.0-rc2","v4.6.0-rc1","v4.5.0-rc1","v4.4.0-rc1","v4.3.0-rc1","v4.2.0-rc1","v0.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-37863.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"}]}