{"id":"CVE-2026-56384","aliases":["GHSA-x76w-8c62-48mg"],"url":"https://o3.security/vulnerability/CVE-2026-56384","summary":"Craft CMS - Missing Authorization in assets/preview-thumb Endpoint","details":"Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions >= 4.0.0-RC1, <= 4.17.7 and >= 5.0.0-RC1, <= 5.9.13, and is fixed in 4.17.8 and 5.9.14.","published":"2026-06-21T13:27:00.378Z","modified":"2026-08-12T03:51:28.532182966Z","cvss":null,"epss":{"score":0.00331,"percentile":0.25842,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"4.17.8"},{"ecosystem":"Packagist","name":"craftcms/cms","fixedVersion":"5.9.14"}],"fix":{"url":"https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27","label":"craftcms/cms@d30df31"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56384.json"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56384"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint"},{"type":"FIX","url":"https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.532182966Z"}}