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    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.

    Published:Dec 9, 2025
    Last Modified:Dec 10, 2025
    EPS:Dec 9, 2025
    EPSS Score:0.00074
    CVSS Score:9.1

    Affected Products

    Vendor
    Onelogin
    Product
    Ruby-saml
    Vendor
    Saml-toolkits
    Product
    Ruby-saml

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2025-66568 (CVSS 9.3) — The ruby-saml library implements the client side of an SAML authorization. Versions up to and including 1.12.4…
    CVE-2025-25292 (CVSS 9.3) — ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication …
    CVE-2025-25291 (CVSS 9.3) — ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication …
    CVE-2025-25293 (CVSS 7.7) — ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Prior to versions …
    CVE-2024-45409 (CVSS 10) — The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.…
    CVE-2015-20108 (CVSS 9.8) — xml_security.rb in the ruby-saml gem before 1.0.0 for Ruby allows XPath injection and code execution because p…
    CVE-2017-11428 (CVSS 7.7) — OneLogin Ruby-SAML 1.6.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicaliza…
    CVE-2016-5697 (CVSS 7.5) — Ruby-saml before 1.3.0 allows attackers to perform XML signature wrapping attacks via unspecified vectors.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High