CVE-2026-27129
published 2026-02-24CVE-2026-27129: 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…
PriorityP341medium6.5CVSS 3.1
AVNACLPRLUINSUCNIHAN
EPSS
0.42%
33.7th percentile
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 uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection. This is a bypass of the security fix for CVE-2025-68437. Exploitation requires GraphQL schema permissions for editing assets in the `` volume and creating assets in the `` 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
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| craftcms | cms | >= 3.5.0 < 4.16.19 | 4.16.19 |
| craftcms | cms | >= 5.0.0-RC1 < 5.8.23 | 5.8.23 |
| craftcms | craft_cms | — | — |
| craftcms | craft_cms | >= 3.5.0 < 4.16.19 | 4.16.19 |
| craftcms | craft_cms | >= 5.0.1 < 5.8.23 | 5.8.23 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
nvdv4.05.7MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
ghsa5.0MEDIUM
osv5.0MEDIUM
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GHSA
Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
ghsa·2026-02-24·CVSS 5.0
CVE-2026-27129 [MEDIUM] CWE-918 Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
The SSRF validation in Craft CMS’s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection.
This is a bypass of the security fix for CVE-2025-68437 ([GHSA-x27p-wfqw-hfcc](https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc)).
## Required Permissions
Exploitation requires GraphQL schema permissions for:
- Edit assets in the `` volume
- Create assets in the `` volume
These permissions may be granted to:
- Authenticated users with appropriate GraphQL schema access
- Public Schema (if misconfig
OSV
Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
osv·2026-02-24·CVSS 5.0
CVE-2026-27129 [MEDIUM] Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
Craft CMS: Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
The SSRF validation in Craft CMS’s GraphQL Asset mutation uses `gethostbyname()`, which only resolves IPv4 addresses. When a hostname has only AAAA (IPv6) records, the function returns the hostname string itself, causing the blocklist comparison to always fail and completely bypassing SSRF protection.
This is a bypass of the security fix for CVE-2025-68437 ([GHSA-x27p-wfqw-hfcc](https://github.com/craftcms/cms/security/advisories/GHSA-x27p-wfqw-hfcc)).
## Required Permissions
Exploitation requires GraphQL schema permissions for:
- Edit assets in the `` volume
- Create assets in the `` volume
These permissions may be granted to:
- Authenticated users with appropriate GraphQL schema access
- Public Schema (if misconfig
No detection rules found.
No public exploits indexed.
2026-02-24
Published