VDB
CVE-2025-66567
CVE-2025-66567
PUBLISHED
CVSS 9.300000190734863 CRITICAL
Ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)
EPSS 0.05% · 16.1th percentile
Risk Scores
CVSS 4.0
9.300000190734863
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS Score
0.05%
16.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| RubyGems | ruby-saml | 0 |
| SAML-Toolkits | ruby-saml | * |
| onelogin | ruby-saml | 0 |
Exploit Intelligence
- CIRCL seen: CVE-2025-66567 (circl-sighting)
- CIRCL seen: CVE-2025-66567 (circl-sighting)
- CIRCL seen: CVE-2025-66567 (circl-sighting)
- CIRCL seen: CVE-2025-66567 (circl-sighting)
- CIRCL seen: CVE-2025-66567 (circl-sighting)
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3 (circl)
- https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97 (circl)
- https://github.com/advisories/GHSA-754f-8gm6-c4r2 (circl)
- CVE-2025-66567.yml (github-poc)
- saml_phpsaml.php (github-poc)
…and 13 more exploits
Timeline
- Dec 8, 2025 CVE Published
- Dec 9, 2025 EPSS Score
- Dec 9, 2025 PoC Published
- Dec 9, 2025 PoC Published
- Dec 9, 2025 PoC Published
- Dec 10, 2025 PoC Published
- Dec 11, 2025 PoC Published
- Dec 12, 2025 CVE Updated
- Dec 13, 2025 EPSS Score
- Dec 17, 2025 EPSS Score
- Dec 22, 2025 EPSS Score
- Dec 26, 2025 EPSS Score
References
- https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3 url
- https://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97 url
- https://github.com/advisories/GHSA-754f-8gm6-c4r2 url
- https://nvd.nist.gov/vuln/detail/CVE-2025-66567 advisory
- https://github.com/SAML-Toolkits/ruby-saml package
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby-saml/CVE-2025-66567.yml url