{"action":"Upgrade craftcms/cms to 4.17.8 or later.","affected":[{"fixed":"4.17.8","introduced":"4.0.0-RC1"},{"fixed":"5.9.14","introduced":"5.0.0-RC1"}],"component":"craftcms/cms","cve_ids":["CVE-2026-56384"],"ecosystem":"Packagist","epss":0.00331,"exploited":false,"fixed_versions":["4.17.8","5.9.14"],"ghsa_id":"GHSA-x76w-8c62-48mg","id":"tcs_01M5KFASQ42KGAC2H31N2N3AZD","modified_at":"2026-08-06T21:15:55.729417347Z","published_at":"2026-07-06T20:28:07Z","references":["https://osv.dev/vulnerability/GHSA-x76w-8c62-48mg","https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg","https://nvd.nist.gov/vuln/detail/CVE-2026-56384","https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27","https://github.com/craftcms/cms","https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-x76w-8c62-48mg","url":"https://osv.dev/vulnerability/GHSA-x76w-8c62-48mg"}],"summary":"Craft CMS: Authenticated \"assets/preview-thumb\" discloses signed fallback transform preview link to CP users without asset-view permission"}