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CVE-2020-5415

30
FAUCET Score

CVE-2020-5415 describes an identity spoofing vulnerability in Concourse versions prior to 6.3.1 and 6.4.1 when configured with the GitLab authentication connector. An attacker can impersonate another user by creating a GitLab account with the same full name as a user already granted Concourse team access. This critical vulnerability, rated 10.0 CVSS, allows for complete compromise of confidentiality and integrity without user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.3.1CPE matchmatch criteria
cpe:2.3:a:pivotal_software:concourse:*:*:*:*:*:*:*:*
>= 6.4.0, < 6.4.1CPE matchmatch criteria
cpe:2.3:a:pivotal_software:concourse:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

10.0CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
6.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 51st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/concourse/concourseFixed in: 6.4.1
gopatch availablevia ghsa
Product: github.com/concourse/dexFixed in: 6.4.1
gopatch availablevia ghsa
Product: github.com/concourse/dexFixed in: 0.0.0-20200730150203-821b48abfd88
gopatch availablevia ghsa
Product: github.com/concourse/concourseFixed in: 0.0.0-20200730151558-b00d1c8d8576
gopatch availablevia ghsa
Product: github.com/concourse/concourseFixed in: 6.3.1
gopatch availablevia ghsa
Product: github.com/concourse/dexFixed in: 6.3.1
gopatch availablevia ghsa
Product: github.com/concourse/concourseFixed in: 1.6.1-0.20200730151558-b00d1c8d8576

Vendor Advisories (1)

goGHSA-627p-rr78-99rjhigh

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

Dec 20, 2021

References

github.com / concourse/concourse/security/advisories/GHSA-627p-rr78-99rj
PatchThird Party Advisory
tanzu.vmware.com / security/cve-2020-5415
Third Party Advisory