{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260320113102-f2b3d1c6a945 or later.","affected":[{"fixed":"8.0.0-20260320113102-f2b3d1c6a945","introduced":"8.0.0-20260304132957-9f2616376582"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-4055"],"ecosystem":"Go","epss":0.00152,"exploited":false,"fixed_versions":["8.0.0-20260320113102-f2b3d1c6a945"],"ghsa_id":"GHSA-6cfr-wp44-6qmv","id":"tcs_01M5KEZZ0XMHJ228PCA9HPXP5Y","modified_at":"2026-06-25T18:56:11.866382944Z","published_at":"2026-05-21T09:32:11Z","references":["https://osv.dev/vulnerability/GHSA-6cfr-wp44-6qmv","https://nvd.nist.gov/vuln/detail/CVE-2026-4055","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-6cfr-wp44-6qmv","url":"https://osv.dev/vulnerability/GHSA-6cfr-wp44-6qmv"}],"summary":"Mattermost has an Incorrect Authorization issue"}