CVE-2026-27129 (GCVE-0-2026-27129)
Vulnerability from cvelistv5 – Published: 2026-02-24 02:45 – Updated: 2026-02-28 02:17
VLAI
EPSS
VEX
Title
Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
Summary
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 `<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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-28 02:16 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/craftcms/cms/security/advisori… | x_refsource_CONFIRM |
| https://github.com/craftcms/cms/security/advisori… | x_refsource_MISC |
| https://github.com/craftcms/cms/commit/2825388b4f… | x_refsource_MISC |
Impacted products
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"version": "\u003e= 4.5.0-RC1, \u003c 4.16.19"
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"version": "\u003e= 5.0.0-RC1, \u003c 5.8.23"
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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