{"id":"GHSA-6cfr-wp44-6qmv","summary":"Mattermost has an Incorrect Authorization issue","details":"Mattermost versions 11.5.x \u003c= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629.","aliases":["CVE-2026-4055","GO-2026-5173"],"modified":"2026-06-25T18:56:11.866382944Z","published":"2026-05-21T09:32:11Z","database_specific":{"cwe_ids":["CWE-863"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-06-23T21:41:20Z","nvd_published_at":"2026-05-21T08:16:23Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4055"},{"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":"8.0.0-20260304132957-9f2616376582"},{"fixed":"8.0.0-20260320113102-f2b3d1c6a945"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-6cfr-wp44-6qmv/GHSA-6cfr-wp44-6qmv.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"}]}