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Vulnerabilities / CVE-2020-5415

critical

CVE-2020-5415

GitLab auth uses full name instead of username as user ID, allowing impersonation

Published Modified CWE 290
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
GHSA7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Bitnami10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by NVD, Bitnami. Rated lower by GHSA (high).

Description

Concourse, versions prior to 6.3.1 and 6.4.1, in installations which use the GitLab auth connector, is vulnerable to identity spoofing by way of configuring a GitLab account with the same full name as another user who is granted access to a Concourse team. GitLab groups do not have this vulnerability, so GitLab users may be moved into groups which are then configured in the Concourse team.

Affected packages and fixed versions

SourcePackageFixed in
bitnami::Bitnami Vulnerability Databaseconcourse6.3.1, 6.4.1
go::GitHub Security Advisory Gogithub.com/concourse/concourse, github.com/concourse/dex6.4.1, 6.3.1, 0.0.0-20200730151558-b00d1c8d8576, 1.6.1-0.20200730151558-b00d1c8d8576 and 1 more
Show all 3 entries from 2 sources
SourcePackageFixed in
bitnami::Bitnami Vulnerability Databaseconcourse6.3.1, 6.4.1
go::GitHub Security Advisory Gogithub.com/concourse/concourse6.4.1, 6.3.1, 0.0.0-20200730151558-b00d1c8d8576, 1.6.1-0.20200730151558-b00d1c8d8576
go::GitHub Security Advisory Gogithub.com/concourse/dex6.4.1, 6.3.1, 0.0.0-20200730150203-821b48abfd88

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.