{"id":"GHSA-gvg4-jhmr-6j23","summary":"Mattermost doesn't check if {{team_id}} was being changed when updating playbooks","details":"Mattermost versions 11.5.x \u003c= 11.5.1, 10.11.x \u003c= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552","aliases":["CVE-2026-4286","GO-2026-5404"],"modified":"2026-06-25T23:11:41.816948577Z","published":"2026-05-18T09:31:48Z","database_specific":{"github_reviewed_at":"2026-06-01T15:19:14Z","nvd_published_at":"2026-05-18T09:16:22Z","cwe_ids":["CWE-863"],"severity":"LOW","github_reviewed":true},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4286"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-playbooks/commit/e1d6ec2c94e695fb74e0c0c11c0d45e028bb96f3"},{"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-gvg4-jhmr-6j23/GHSA-gvg4-jhmr-6j23.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-gvg4-jhmr-6j23/GHSA-gvg4-jhmr-6j23.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":"1.41.1-0.20260213020129-e1d6ec2c94e6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-gvg4-jhmr-6j23/GHSA-gvg4-jhmr-6j23.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}