{"id":"GHSA-m79q-8qf5-v622","summary":"Mattermost doesn't check public/private permissions","details":"Mattermost versions 11.5.x \u003c= 11.5.1, 10.11.x \u003c= 10.11.13, 11.4.x \u003c= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591","aliases":["CVE-2026-6343","GO-2026-5494"],"modified":"2026-06-25T23:11:45.952658730Z","published":"2026-05-18T09:31:48Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-06-01T15:38:19Z","nvd_published_at":"2026-05-18T09:16:23Z","cwe_ids":["CWE-863"],"severity":"MODERATE"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6343"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-playbooks/commit/887d9cacb61655d40f20ad9d6e35b408a127c380"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"11.5.0"},{"fixed":"11.5.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-m79q-8qf5-v622/GHSA-m79q-8qf5-v622.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"11.4.0"},{"fixed":"11.4.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-m79q-8qf5-v622/GHSA-m79q-8qf5-v622.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0"},{"fixed":"10.11.14"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-m79q-8qf5-v622/GHSA-m79q-8qf5-v622.json"}},{"package":{"name":"github.com/mattermost/mattermost-plugin-playbooks","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-plugin-playbooks"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.41.1-0.20260309184833-887d9cacb616"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-m79q-8qf5-v622/GHSA-m79q-8qf5-v622.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}