{"schema_version":"1.7.3","id":"GO-2026-4495","published":"2026-02-23T18:23:12Z","modified":"2026-02-23T19:41:17.607287Z","aliases":["CVE-2026-20796","GHSA-2xf7-hmf6-p64j"],"summary":"Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server","details":"Mattermost doesn't properly validate channel membership at the time of data retrieval in github.com/mattermost/mattermost-server","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0+incompatible"},{"fixed":"10.11.10+incompatible"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4495.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-2xf7-hmf6-p64j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20796"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"review_status":"UNREVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4495"}}