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CVE-2020-26290 Details

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).

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.6 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CNA: [email protected]CVSS-B:9.3 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	CVE	PatchThird Party Advisory
https://github.com/dexidp/dex/releases/tag/v2.27.0	CVE	Third Party Advisory
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5	CVE	Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md	CVE	Not ApplicableThird Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	CVE	Not ApplicableThird Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	CVE	Not ApplicableThird Party Advisory
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	CVE	Not ApplicableThird Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	CVE	Not ApplicableThird Party Advisory
https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8	[email protected]	PatchThird Party Advisory
https://github.com/dexidp/dex/releases/tag/v2.27.0	[email protected]	Third Party Advisory
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5	[email protected]	Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md	[email protected]	Not ApplicableThird Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md	[email protected]	Not ApplicableThird Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md	[email protected]	Not ApplicableThird Party Advisory
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7	[email protected]	Not ApplicableThird Party Advisory
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/	[email protected]	Not ApplicableThird Party Advisory

see all 16 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-347	Improper Verification of Cryptographic Signature	[email protected]

Affected Products

Product	Versions
linuxfoundation dex	< 2.27.0
CPE cpe:2.3:a:linuxfoundation:dex:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Dec 30, 2020	Initial Analysis	[email protected]