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CVE-2026-27127
February 24, 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.
Affected Packages
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0 <5.8.23
Fix Suggestion:
Update to version 5.8.23
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0 <5.8.23
Fix Suggestion:
Update to version 5.8.23
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=5.0.0 <5.8.23
Fix Suggestion:
Update to version 5.8.23
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
https://github.com/craftcms/cms.git (GITHUB):
Affected version(s) >=4.0.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23
Fix Suggestion:
Update to version 5.8.23
craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
craftcms/cms (PHP):
Affected version(s) >=3.5.0 <4.16.19
Fix Suggestion:
Update to version 4.16.19
craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23
Fix Suggestion:
Update to version 5.8.23
craftcms/cms (PHP):
Affected version(s) >=5.0.0-RC1 <5.8.23
Fix Suggestion:
Update to version 5.8.23
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CVSS v4
Base Score:
7
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Time-of-check Time-of-use (TOCTOU) Race Condition
EPSS
Base Score:
0.01