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CVE-2024-45409 — Vulnerability in ruby-saml — CVE Details

CRITICAL

SAML authentication bypass via Incorrect XPath selector

Published September 10, 2024Updated August 7, 2026Source: osv

Summary

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 was reported by ahacker1 of SecureSAML (ahacker1@securesaml.com)

Advisory Timeline

  • First published September 10, 2024 (762 days ago).
  • Last revised August 7, 2026 — 696 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update ruby-saml to 1.12.3 or later
gem install ruby-saml -v 1.12.3
Bundler
Update ruby-saml to 1.17.0 or later
gem install ruby-saml -v 1.17.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
ruby-saml
rubygems
0.0.5, 0.0.6, 0.0.7, 0.0.8 (+76 more)1.12.3
ruby-saml
rubygems
1.13.0, 1.14.0, 1.15.0, 1.16.01.17.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-347
    Improper Verification of Cryptographic SignatureMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

References

Frequently Asked Questions

What is CVE-2024-45409?
SAML authentication bypass via Incorrect XPath selector This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2024-45409?
CVE-2024-45409 affects ruby-saml. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2024-45409 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-jw9c-mfg7-9rx2
BIT-gitlab-2024-45409

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