CVE-2017-11427

high

Description

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.

References

https://github.com/advisories/GHSA-j8j8-348v-wfm3

https://github.com/CHYbeta/CVE-2017-11427-DEMO

https://www.kb.cert.org/vuls/id/475445

https://euvd.enisa.europa.eu/vulnerability/EUVD-2019-0118

https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations

Details

Source: Mitre, NVD

Published: 2019-04-17

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 8.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.04007