ThreatCluster

Ruby SAML Vulnerability Allows Authentication Bypass

First seen 9 Dec 2025, 19:45 UTC • •50

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ThreatCluster •March 12, 2026 at 13:27 UTC

A critical vulnerability in the Ruby SAML library enables attackers to perform signature wrapping attacks, allowing them to bypass SAML authentication entirely. This flaw affects systems relying on the Ruby SAML library for secure authentication processes. Organizations using this library are urged to assess their security measures and apply necessary updates.

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Technique (1)

Zero-day Exploit

Affected Platform (1)

Ruby

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Zero-day Exploit targets Ruby

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