Improper Verification of Cryptographic Signature in SAML SSO for Ruby - CVE-2025-66567
Published: December 9, 2025
Vulnerability identifier: #VU119405
CSH Severity: High
CVSS v4.0: 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:U/U:Amber
CVE-ID: CVE-2025-66567
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SAML-Toolkits
Affected software:
SAML SSO for Ruby
SAML SSO for Ruby
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to improper input validation when parsing XML input. A remote attacker can execute a Signature Wrapping attack and bypass authentication process.
Note, the vulnerability exists due to an incomplete fix for #VU105688 (CVE-2025-25292).
How to mitigate CVE-2025-66567
Install updates from vendor's website.