Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Craftcms | Craft Cms | >= 3.5.1, < 4.16.19 |
Related Weaknesses (CWE)
References
- https://github.com/craftcms/cms/commit/a4cf3fb63bba3249cf1e2882b18a2d29e77a8575Patch
- https://github.com/craftcms/cms/security/advisories/GHSA-gp2f-7wcm-5fhxExploitMitigationVendor Advisory
- https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfccExploitPatchVendor Advisory
FAQ
What is CVE-2026-27127?
CVE-2026-27127 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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 separa...
How severe is CVE-2026-27127?
CVE-2026-27127 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27127?
Check the references section above for vendor advisories and patch information. Affected products include: Craftcms Craft Cms.