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CVE-2025-66567— ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)

Quick assessment

Affected
SAML-Toolkits ruby-saml
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.

Onelogin OneLogin ruby-saml是美国Onelogin公司的一款基于Ruby的、用于单点登录（SSO）服务的SAML（安全断言标记语言）库。 OneLogin ruby-saml 1.12.4及之前版本存在数据伪造问题漏洞，该漏洞源于XML解析差异，可能导致签名包装攻击和认证绕过。

AI Predicted 9.8 Difficulty: Easy EPSS 0.39% · P31
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I. Basic Information for CVE-2025-66567

Vulnerability Information
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Vulnerability Title
ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)
Source: CVE Program / CVE List V5
Vulnerability Description
The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. This issue is fixed in version 1.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
OneLogin ruby-saml 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Onelogin OneLogin ruby-saml是美国Onelogin公司的一款基于Ruby的、用于单点登录（SSO）服务的SAML（安全断言标记语言）库。 OneLogin ruby-saml 1.12.4及之前版本存在数据伪造问题漏洞，该漏洞源于XML解析差异，可能导致签名包装攻击和认证绕过。
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
SAML-Toolkits ruby-saml < 1.18.0 -

II. Public POCs for CVE-2025-66567

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III. Intelligence Information for CVE-2025-66567

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Patches & Fixes for CVE-2025-66567 (1)

Vendor Advisories for CVE-2025-66567 (1)

IV. Related Vulnerabilities

Same product: ruby-saml
Same vendor: SAML-Toolkits
Same weakness: CWE-347

V. Comments for CVE-2025-66567

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