{"id":"GHSA-4pmx-622h-x359","summary":"Mattermost fails to verify run_create permission for empty playbookId","details":"Mattermost versions 11.3.x \u003c= 11.3.0, 11.2.x \u003c= 11.2.2 fail to verify run_create permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542","aliases":["CVE-2026-26304","GO-2026-4812"],"modified":"2026-03-23T18:56:17.889400Z","published":"2026-03-16T21:34:32Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-03-20T22:26:12Z","nvd_published_at":"2026-03-16T20:16:17Z","cwe_ids":["CWE-863"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26304"},{"type":"WEB","url":"https://github.com/mattermost/mattermost-plugin-playbooks/commit/705f54a818410f3612df3865bfde608ed471037e"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost-plugin-playbooks"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"affected":[{"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":"1.41.1-0.20260316224925-705f54a81841"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-4pmx-622h-x359/GHSA-4pmx-622h-x359.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:N/I:L/A:N"}]}