{"id":"CVE-2025-66567","title":"The ruby-saml library is for implementing the client side of a SAML authorization","summary":"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 Nokogi…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-347"],"vendor":"onelogin","product":"ruby-saml","affected":["ruby-saml < 1.18.0"],"patched":["ruby-saml 1.18.0"],"published":"2025-12-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T21:10:00.183","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-66567","references":[{"url":"https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97","label":"security-advisories@github.com"},{"url":"https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-754f-8gm6-c4r2","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00392,"epssPercentile":0.31647,"ingestedAt":"2026-10-14T21:57:04.742Z","slug":"CVE-2025-66567","body":"## Overview\n\nThe 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.\n\n## Affected\n\n- `ruby-saml < 1.18.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `ruby-saml 1.18.0`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}