{"id":"CVE-2026-56384","title":"Craft CMS - Missing Authorization in assets/preview-thumb Endpoint","summary":"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 p…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-862"],"vendor":"craftcms","product":"cms","affected":["cms >= 4.0.0-RC1 < 4.17.8","cms >= 5.0.0-RC1 < 5.9.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-24T15:40:42.349785Z"},"published":"2026-06-21","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:06:09.897Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56384","references":[{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg","label":"GitHub Security Advisory (GHSA-x76w-8c62-48mg)"},{"url":"https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27","label":"https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27"},{"url":"https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint","label":"VulnCheck Advisory: Craft CMS - Missing Authorization in assets/preview-thumb Endpoint"}],"tags":["cve.org"],"epss":0.00331,"epssPercentile":0.26445,"ingestedAt":"2026-11-08T14:51:22.349Z","slug":"CVE-2026-56384","body":"## Overview\n\nCraft 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.\n\n## Affected\n\n- `cms >= 4.0.0-RC1 < 4.17.8`\n- `cms >= 5.0.0-RC1 < 5.9.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}