{"id":"CVE-2017-18873","details":"An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.","aliases":["GHSA-x6mw-hf2j-vqpc","GO-2026-4282"],"modified":"2026-03-14T09:26:05.404191Z","published":"2020-06-19T18:15:10.600Z","related":["SUSE-SU-2026:0757-1"],"references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"0"},{"fixed":"61d6a7434b18612c52d0d6b7565032065262e096"},{"introduced":"a5ce36d0882ae1b4b409a7b68233bf89591a5f95"},{"fixed":"c0aafbcdc221970054869b6c03db77c1dcc63289"},{"introduced":"0"},{"last_affected":"2a76eeeeee9acdd9aaebc3ec94a40254b933c966"},{"introduced":"0"},{"last_affected":"aa2b82727f0f1b3edb79f6d31c04b8fd0d718455"},{"introduced":"0"},{"last_affected":"8966452d1183e94fecc373b9d08c65a0573cbbc6"},{"introduced":"0"},{"last_affected":"8966452d1183e94fecc373b9d08c65a0573cbbc6"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"4.1.2"},{"introduced":"4.2.0"},{"fixed":"4.2.1"},{"introduced":"0"},{"last_affected":"4.3.0-rc1"},{"introduced":"0"},{"last_affected":"4.3.0-rc2"},{"introduced":"0"},{"last_affected":"4.3.0-rc3"},{"introduced":"0"},{"last_affected":"4.3.0-rc4"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-18873.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}