Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
Priority MEDIUM 49CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-287.
Summary
OneLogin PythonSAML 2.3.0 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Why it matters now
EPSS 0.04368 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed PythonSAML (OneLogin): 2.3.0python-saml (PyPI): 2.4.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SAML-Toolkits | PythonSAML | before 2.3.0 | 2.3.0 | Patch available | CNA |
| — | python-saml (PyPI) | before 2.4.0 | 2.4.0 | Patch available | GHSA-j8j8-348v-wfm3 |
- PythonSAML VendorSAML-Toolkits Affected before 2.3.0 Fixed in 2.3.0 Patch available CNA
- python-saml (PyPI) Vendor— Affected before 2.4.0 Fixed in 2.4.0 Patch available GHSA-j8j8-348v-wfm3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:onelogin:pythonsaml:*:*:*:*:*:*:*:* | up to 2.3.0 | Vulnerable | SAML-Toolkits |
- cpe:2.3:a:onelogin:pythonsaml:*:*:*:*:*:*:*:* Versions up to 2.3.0 Vulnerable ·SAML-Toolkits
Remediation
- Fix · CNA PythonSAML (OneLogin) Fixed in 2.3.0
- Fix · GHSA-j8j8-348v-wfm3 python-saml (PyPI) Fixed in 2.4.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2017-11427
- 2026-10-03 Alias added: GHSA-j8j8-348v-wfm3
References
Advisory 3
Sources
- CVE-2017-11427 · CVE Program
- CVE-2017-11427 · NVD
- FIRST EPSS
- GHSA-j8j8-348v-wfm3 · GitHub Advisory Database · CC BY 4.0
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