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CVE-2020-26290

9.3 · CRITICAL

Dex is a federated OpenID Connect provider written in Go.

Published Dec 28, 2020CWE-347EPSS 0.99%

Overview

CVE-2020-26290 is a critical-severity vulnerability. It was published on December 28, 2020 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8GitHubgithub.com/dexidp/dex/releases/tag/v2.27.0GitHubgithub.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5GitHubgithub.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.mdGitHubgithub.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.mdGitHubgithub.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.mdGitHubgithub.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7Refmattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/GitHubgithub.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8GitHubgithub.com/dexidp/dex/releases/tag/v2.27.0

How CyberStrike helps

Frequently asked questions

What is CVE-2020-26290?

CVE-2020-26290 is a critical-severity vulnerability. It was published on December 28, 2020 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2020-26290?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2020-26290?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2020-26290?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2020-26290 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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