{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.","affected":[{"fixed":"10.11.14+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.5.2+incompatible","introduced":"11.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4286"],"ecosystem":"Go","epss":0.00143,"exploited":false,"fixed_versions":["10.11.14+incompatible","11.5.2+incompatible"],"ghsa_id":"GHSA-gvg4-jhmr-6j23","id":"tcs_01M5KGM25AEANMBS5VTZE8C9DW","modified_at":"2026-06-25T23:00:16.074837707Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5404","https://github.com/advisories/GHSA-gvg4-jhmr-6j23","https://nvd.nist.gov/vuln/detail/CVE-2026-4286","https://github.com/mattermost/mattermost-plugin-playbooks/commit/e1d6ec2c94e695fb74e0c0c11c0d45e028bb96f3","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-5404#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GO-2026-5404"},{"source":"nvd","source_id":"CVE-2026-4286","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4286"}],"summary":"Mattermost doesn't check if {{team_id}} was being changed when updating playbooks in github.com/mattermost/mattermost-plugin-playbooks"}