CVE-2020-26290

    Dashboard / Vulnerabilities / CVE-2020-26290

    CVE-2020-26290

    Published: 28 Dec 2020Last Modified: 9 Jul 2026

    Summary:

    Details: 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).

    References: https://github.com/dexidp/dex/releases/tag/v2.27.0, https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5, https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md, https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md, https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md, https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7, https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/, https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0f9e2888ab65c5b18c4881eaeeb7e38d997e1d92

    Affected versions

    v2.26.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2020-26290 | CVE-DB