CVE-2025-66567

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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97	Patch
https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3	Vendor Advisory
https://github.com/advisories/GHSA-754f-8gm6-c4r2	Not Applicable

Configurations

Configuration 1 (hide)

cpe:2.3:a:onelogin:ruby-saml:*:*:*:*:*:*:*:*

History

10 Dec 2025, 21:27

Type	Values Removed	Values Added
References	~~() https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97 -~~	() https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97 - Patch
References	~~() https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3 -~~	() https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3 - Vendor Advisory
References	~~() https://github.com/advisories/GHSA-754f-8gm6-c4r2 -~~	() https://github.com/advisories/GHSA-754f-8gm6-c4r2 - Not Applicable
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1
CPE		cpe:2.3:a:onelogin:ruby-saml::::::::
First Time		Onelogin Onelogin ruby-saml

09 Dec 2025, 16:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-09 16:18

Updated : 2025-12-10 21:27

NVD link : CVE-2025-66567

Mitre link : CVE-2025-66567

CVE.ORG link : CVE-2025-66567

JSON object : View

Products Affected

onelogin

ruby-saml

CWE

CWE-347

Improper Verification of Cryptographic Signature

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