CVE-2026-27127 Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding

Craft is a content management system CMS. In versions 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22, the SSRF validation in Craft CMS’s GraphQL Asset mutation performs DNS resolution separately from the HTTP request. This Time-of-Check-Time-of-Use TOCTOU vulnerability enables DNS rebindi...

PT-2026-21609

Name of the Vulnerable Software and Affected Versions Craft CMS versions 4.5.0-RC1 through 4.16.18 Craft CMS versions 5.0.0-RC1 through 5.8.22 Description Craft CMS is susceptible to a Server-Side Request Forgery SSRF vulnerability in its GraphQL Asset mutation. The validation process performs DN...