Medium severity · published Feb 24, 2026
CVE-2026-27127
Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding
6.3
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CM
cms · craftcms
>= 4.5.0-RC1, < 4.16.19; >= 5.0.0-RC1, < 5.8.23 · source: vendor
CC
Craft Cms · Craftcms
3.5.1 before 4.16.19; 5.0.1 before 5.8.23; 3.5.0; 5.0.0; 5.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27127
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27127
Patch
https://github.com/craftcms/cms/commit/a4cf3fb63bba3249cf1e2882b18a2d29e77a8575
Exploit
https://github.com/craftcms/cms/security/advisories/GHSA-gp2f-7wcm-5fhx
Exploit
https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc
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