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CVE-2025-66567

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

Published: Dec 9, 2025Updated: Dec 10, 2025 Sources: CVE List NVD GHSACWE-347
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.4%
Top 70.1%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-347

Affected Products

ruby-samlSAML-Toolkits
Library
OSS Libraries / generic-library
ruby-samlonelogin
SaaS
Security Products / identity-access-mgmt
ruby-samlRubyGemsOSS Libraries
saml-toolkitsoss-projectOSS Librariesaka ruby-saml, saml-toolkits ruby-saml
onelogincommercialUSSecurity Productsaka onelogin saml sso, onelogin saml
rubygemspackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3
github.com
https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
github.com
https://github.com/advisories/GHSA-754f-8gm6-c4r2
github.com
and 3 more references View all →

Timeline

Published
Dec 9, 2025
Last Updated
Dec 10, 2025

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