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CVE-2025-25292 is an authentication bypass vulnerability in ruby-saml, a Ruby library used to implement SAML SSO. The issue affects versions prior to 1.12.4 and 1.18.0. According to the provided content, the flaw is caused by a parser differential between REXML and Nokogiri/libxml2 when processing the same XML input. ruby-saml can validate XML signatures against one parser interpretation while downstream application logic consumes a different effective document structure. This discrepancy enables a Signature Wrapping-style attack in which a crafted SAMLResponse causes signature validation to succeed for a legitimate signed assertion while the application processes attacker-controlled assertion content instead. The content specifically attributes the issue to XML round-trip behavior and inconsistent document reconstruction during signature validation, which can alter how attacker-controlled XML fragments are interpreted.
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Critical vulnerability impacting GitLab SAML-based SSO that can enable authentication bypass and user impersonation (as described in the content).
A previously demonstrated issue (referenced via SAML Raider) involving libxml2 canonicalization logic; the described exploit approach relied on XML that is not well-formed, limiting practical use in the scenario discussed.
A critical vulnerability in GitLab's SAML-based SSO authentication mechanism that allows attackers to bypass authentication and impersonate users.
A previously patched SAML-related authentication vulnerability referenced as part of GitLab's security history.
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Cross-references every affected SKU, including bundled OEM variants.
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