CVE-2018-5387

Name: CVE-2018-5387
Creator: NVD / NIST
Published: 2018-07-24T15:29:01.187+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.66%

Last modified Jun 17, 2026

CVE-2018-5387 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Wizkunde SAMLBase 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.. EPSS estimates a 1.66% chance of exploitation in the next 30 days.

Description

Wizkunde SAMLBase 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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.66%

73.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Wizkunde	Samlbase	< 1.4.2

References

https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementationsExploit, Third Party Advisory
https://github.com/GoGentoOSS/SAMLBase/commit/482cdf8c090e0f1179073034ebcb609ac7c3f5b3Patch, Third Party Advisory
https://github.com/GoGentoOSS/SAMLBase/issues/3Issue Tracking, Patch, Third Party Advisory
https://www.kb.cert.org/vuls/id/475445Third Party Advisory, US Government Resource
https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementationsExploit, Third Party Advisory
https://github.com/GoGentoOSS/SAMLBase/commit/482cdf8c090e0f1179073034ebcb609ac7c3f5b3Patch, Third Party Advisory
https://github.com/GoGentoOSS/SAMLBase/issues/3Issue Tracking, Patch, Third Party Advisory
https://www.kb.cert.org/vuls/id/475445Third Party Advisory, US Government Resource

Timeline

Published: Jul 24, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5387?

How severe is CVE-2018-5387?

CVE-2018-5387 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.66% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5387?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5387?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST