CVE-2025-66567CRITICAL 9.1EPSS p30.0%

CVE-2025-66567CVE-2025-66567

Description

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 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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.38% probability of exploitation · percentile 30.0% · 2026-06-19T12:03:05Z
Published2025-12-09
Last modified2025-12-10

Underlying weaknesses· 1

CWE-347

References

  1. https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97
  2. https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3
  3. https://github.com/advisories/GHSA-754f-8gm6-c4r2

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

CVE
CVE-2025-66568
CVE
CVE-2025-25291
CVE
CVE-2025-25292
CVE
CVE-2025-54419
CVE
CVE-2026-46490
CVE
CVE-2025-40934
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.