CVE-2026-27127

The record

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 rebinding attacks, where an attacker’s DNS server returns different IP addresses for validation compared to the actual request. This is a bypass of the security fix for CVE-2025-68437 that allows access to all blocked IPs, not just IPv6 endpoints. Exploitation requires GraphQL schema permissions for editing assets in the `<VolumeName>` volume and creating assets in the `<VolumeName>` volume. These permissions may be granted to authenticated users with appropriate GraphQL schema access and/or Public Schema (if misconfigured with write permissions). Versions 4.16.19 and 5.8.23 patch the issue.

Affected packages

Related vulnerabilities

• GHSA-gp2f-7wcm-5fhx Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding Same vulnerability
• GHSA-x27p-wfqw-hfcc Craft CMS vulnerable to Server-Side Request Forgery (SSRF) via GraphQL Asset Upload… Same vulnerability
• GHSA-234q-vvw3-mrfq Craft CMS has unauthenticated activation email trigger with potential user enumeration Also affects craftcms/cms
• CVE-2026-29069 Craft is a content management system (CMS). Also affects craftcms/cms
• CVE-2026-28696 Craft is a content management system (CMS). Also affects craftcms/cms
• CVE-2026-28781 Craft is a content management system (CMS). Also affects craftcms/cms
• CVE-2026-28784 Craft is a content management system (CMS). Also affects craftcms/cms
• CVE-2026-28782 Craft is a content management system (CMS). Also affects craftcms/cms