CVE-2026-27127
MEDIUM
GHSA-gp2f-7wcm-5fhx
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Lifecycle Timeline
4Tags
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.
Analysis
DNS rebinding attacks in Craft CMS 4.5.0-RC1 through 4.16.18 and 5.0.0-RC1 through 5.8.22 allow authenticated attackers to bypass SSRF protections in GraphQL asset mutations by exploiting a Time-of-Check-Time-of-Use race condition between DNS validation and HTTP requests. Attackers with appropriate GraphQL schema permissions can access blocked IP addresses and internal resources that should be restricted. …
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Remediation
Within 30 days: Identify affected systems running versions 4.5.0-RC1 and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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