{"id":"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 \u003e= 4.0.0-RC1, \u003c= 4.17.7 and \u003e= 5.0.0-RC1, \u003c= 5.9.13, and is fixed in 4.17.8 and 5.9.14.","aliases":["GHSA-x76w-8c62-48mg"],"modified":"2026-07-08T08:13:46.971049558Z","published":"2026-06-21T13:27:00.378Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56384.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/craftcms/cms","events":[{"introduced":"daac7c1da2f701f2e9ddee1da1457ce61660b581"},{"introduced":"04755d93f86d07cc183db47db8a0eee106892e30"},{"fixed":"3262cfa628ade304f0e565f9e45b52fab0f32df3"},{"fixed":"13c50dd550fabe74fe5317aeca090d286f1c7556"},{"fixed":"d30df3112220db1ffd6726a3ed11857014c7fb27"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"4.0.0-RC1"},{"fixed":"4.17.8"},{"introduced":"5.0.0-RC1"},{"fixed":"5.9.14"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56384.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}