{"schema_version":"1.7.3","id":"GHSA-x6mw-hf2j-vqpc","published":"2022-05-24T17:21:03Z","modified":"2026-02-26T18:56:01.453798Z","aliases":["CVE-2017-18873","GO-2026-4282"],"summary":"Mattermost Server is vulnerable to channel invisibility DoS via misformatted post","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 misformated post.","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.1.2-0.20171013141717-ee57a5829ab1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-x6mw-hf2j-vqpc/GHSA-x6mw-hf2j-vqpc.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"4.2.1-0.20171013140502-b3e4b0ac9168"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-x6mw-hf2j-vqpc/GHSA-x6mw-hf2j-vqpc.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.3.0-rc1"},{"fixed":"4.3.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-x6mw-hf2j-vqpc/GHSA-x6mw-hf2j-vqpc.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-18873"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/9adaf53e110e0e806b21903111aacb93129668cb"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/b3e4b0ac91682093276a653f7ccd5774aaa9cd06"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/ee57a5829ab162859e0e355dac6cfe6ca1a8f379"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"cwe_ids":["CWE-20"],"github_reviewed":true,"github_reviewed_at":"2026-01-05T20:56:18Z","nvd_published_at":"2020-06-19T18:15:00Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}