CVE-2026-27127— Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding

Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding

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.

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检查时间与使用时间(TOCTOU)的竞争条件

Craft CMS 安全漏洞

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版本存在安全漏洞，该漏洞源于GraphQL Asset突变中的SSRF验证存在TOCTOU问题，可能导致DNS重绑定攻击。

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