{"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":"2026-03-09T01:35:12.939869835Z","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"}]}],"versions":["v4.2.0","v4.2.0-rc4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2017-18873.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}