Craft Cms
CVE-2026-27129
MEDIUM
GHSA-v2gc-rm6g-wrw9
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Craft CMS versions 4.5.0 through 4.16.18 and 5.0.0 through 5.8.22 contain an SSRF bypass in GraphQL Asset mutations where IPv6-only hostnames bypass the security blocklist, allowing authenticated users with GraphQL asset editing permissions to perform server-side request forgery attacks. Public exploit code exists for this vulnerability, which is a regression of a previously patched SSRF issue. Authenticated users with appropriate GraphQL schema permissions can exploit this to access internal resources or perform requests to arbitrary IPv6 addresses.
Technical ContextAI
Classified as CWE-918 (Server-Side Request Forgery (SSRF)). Affects Craft Cms. 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 GraphQ
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
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External POC / Exploit Code
Leaving vuln.today