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CVE-2025-25292 is an authentication bypass vulnerability in ruby-saml, a Ruby library that implements SAML single sign-on. The flaw affects versions prior to 1.12.4 and 1.18.0 and arises from differential parsing behavior between REXML and Nokogiri when processing the same XML input. Because the two parsers can construct materially different document trees from a crafted SAML message, signature verification and subsequent assertion processing can become desynchronized. This parser differential enables a Signature Wrapping attack in which a valid signature is verified over one interpretation of the XML while the application consumes attacker-controlled assertion content from another interpretation. In deployments that rely on ruby-saml for SAML authentication, including downstream integrations such as GitLab when SAML SSO is enabled, successful exploitation can result in authentication bypass and user impersonation within the affected SAML identity provider context.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.