Vulnerability Monitor

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CVE-2020-26290

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).

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.3, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), for affected systems. Impacting 1 product from linuxfoundation organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-12-28T20:15:12.493

Last Modified

2024-11-21T05:19:46.513

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.3 (CRITICAL)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

8.6

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-347

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	linuxfoundation	dex	< 2.27.0	Yes

References

https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 Patch, Third Party Advisory ([email protected])
https://github.com/dexidp/dex/releases/tag/v2.27.0 Third Party Advisory ([email protected])
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 Third Party Advisory ([email protected])
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md Not Applicable, Third Party Advisory ([email protected])
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md Not Applicable, Third Party Advisory ([email protected])
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md Not Applicable, Third Party Advisory ([email protected])
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 Not Applicable, Third Party Advisory ([email protected])
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ Not Applicable, Third Party Advisory ([email protected])
https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/dexidp/dex/releases/tag/v2.27.0 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md Not Applicable, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md Not Applicable, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md Not Applicable, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 Not Applicable, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ Not Applicable, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For linuxfoundation's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.