THREATPORT/VULNERABILITY/CVE-2025-25291
CRITICAL SEVERITY

CVE-2025-25291

Omniauth Saml vulnerability

CVSS
9.8
EPSS
19.5%
EPSS pct
97th
Exploited
No known
ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. ReXML and Nokogiri parse XML differently; the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 fix the issue.
Affected vendor
Omniauth
Affected product
Omniauth Saml
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-347 — Improper Verification of Cryptographic Signature
  • CWE-436 — Interpretation Conflict
Published
2025-03-12

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 19.5% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2025-25291

  • Confirm whether Omniauth Omniauth Saml is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2025-25291.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-25291

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2025-25291 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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