CVE-2020-5415

Concourse's GitLab auth allows impersonation

CRITICAL
10
CVSS Score
Published: August 12, 2020 at 04:40 PM UTC
Updated: June 17, 2026 at 03:21 AM UTC
2 products affected across 2 vendorsConcourseConcourse

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Severity
CRITICAL10
Exploit prediction
EPSS 1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 6.3.16.4.0 ≤ v < 6.4.1
Affected range stops below 6.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.1, so it looks safe — our inference, not a vendor statement
6.3 ≤ v < 6.3.16.4 ≤ v < 6.4.16.36.4
Affected range stops below 6.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-290

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