CVE-2026-56384
1 advisory.
Packagist/craftcms/cms CVE-2026-56384: medium
Craft CMS: Authenticated "assets/preview-thumb" discloses signed fallback transform preview link to CP users without asset-view permission
Action: Upgrade craftcms/cms to 4.17.8 or later.
composer require craftcms/cms:4.17.8composer require craftcms/cms:5.9.14Affected
| introduced | fixed | last affected |
|---|---|---|
| 4.0.0-RC1 | 4.17.8 | - |
| 5.0.0-RC1 | 5.9.14 | - |
Fixed versions
| 4.17.8 | 5.9.14 |
Sources
- osv: 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
CVE-2026-56384 · published · modified · JSON