The ruby-saml library implements the client side of an SAML authorization. Versions up to and including 1.12.4, are vulnerable to authentication bypass through the libxml2 canonicalization process used by Nokogiri for document transformation, which allows an attacker to execute a Signature Wrapping attack. When libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. ruby-saml then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded. This issue is fixed in version 1.18.0.
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XOnelogin Ruby Saml
APPOnelogin< 1.18.0
Related vulnerabilities
Auth Bypass w ruby-saml przez atak Signature Wrapping (CVE-2025-66567)
Authentication bypass w ruby-saml poprzez Signature Wrapping (SAML SSO)
Pominięcie uwierzytelnienia SAML SSO przez atak Signature Wrapping w ruby-saml
Ruby-SAML: pominięcie weryfikacji podpisu odpowiedzi SAML — Auth Bypass
xml_security.rb in the ruby-saml gem before 1.0.0 for Ruby allows XPath injection and code execution because p...