CVE-2026-55792 Craft CMS: Sensitive File Disclosure / Server-Side File Read

Craft CMS is a content management system CMS. In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission ...

CVE-2026-55792

Craft CMS is vulnerable in versions 4.0.0-RC1 through 4.17.x and 5.0.0-RC1 through 5.9.x due to dataUrl() being in the Twig sandbox allowlist. A control panel user with the utility:system-messages permission can embed a file-reading payload in system emails, causing the server to read targeted fi...