CVE-2026-27127 PUBLISHED

Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding

Assigner: GitHub_M
Reserved: 17.02.2026 Published: 24.02.2026 Updated: 24.02.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
CVSS Score: 7

Product Status

Vendor craftcms
Product cms
Versions
  • Version >= 4.5.0-RC1, < 4.16.19 is affected
  • Version >= 5.0.0-RC1, < 5.8.23 is affected

References

Problem Types

  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CWE