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CVE-2024-45409

CriticalPublished

The Ruby SAML library vulnerable to a SAML authentication bypass via Incorrect XPath selector

Published: Sep 10, 2024
Updated: Nov 11, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 5, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

EPSS probability estimate

10.7%

Moderate · next 30 days

Percentile: 95.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.

Sources

CVE-2024-45409Exploit
Ruby-SAML / GitLab Authentication Bypass (CVE-2024-45409) exploit

Responsible use

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