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CVE-2026-27129— Cloud Metadata SSRF Protection Bypass via IPv6 Resolution

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 4.5.0-RC1版本至4.16.18版本和5.0.0-RC1版本至5.8.22版本存在代码问题漏洞，该漏洞源于GraphQL Asset突变中的SSRF验证仅解析IPv4地址，可能导致SSRF保护被绕过。

AI Predicted 8.1 Difficulty: Easy EPSS 0.42% · P34
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I. Basic Information for CVE-2026-27129

Vulnerability Information
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Vulnerability Title
Cloud Metadata SSRF Protection Bypass via IPv6 Resolution
Source: CVE Program / CVE List V5
Vulnerability 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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS: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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 4.5.0-RC1版本至4.16.18版本和5.0.0-RC1版本至5.8.22版本存在代码问题漏洞，该漏洞源于GraphQL Asset突变中的SSRF验证仅解析IPv4地址，可能导致SSRF保护被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms >= 4.5.0-RC1, < 4.16.19 -

II. Public POCs for CVE-2026-27129

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III. Intelligence Information for CVE-2026-27129

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Patches & Fixes for CVE-2026-27129 (1)

Vendor Advisories for CVE-2026-27129 (1)

Same Patch Batch · craftcms · 2026-02-24 · 4 CVEs total

CVE-2026-27127 Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding
CVE-2026-27126 Craft CMS has Stored XSS in Table Field via "HTML" Column Type
CVE-2026-27128 Craft CMS's race condition in Token Service potentially allows for token usage greater tha

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-918

V. Comments for CVE-2026-27129

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