# CVE-2020-5415: GitLab auth uses full name instead of username as user ID, allowing impersonation

Source: https://junglewise.ai/threats/cve-2020-5415-gitlab-auth-uses-full-name-instead-of-username-as-user-id-allowing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-12-20  
License: CC BY 4.0 with a link back

CVE-2020-5415 · Severity: low · CVSS 3.1 · Published 2021-12-20

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

Technologies: [github.com/concourse/concourse (Go)](https://junglewise.ai/threats/technologies/github-com-concourse-concourse). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2020-5415 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-5415 being exploited in the wild.

**How severe is CVE-2020-5415?** Low severity, with a CVSS score of 3.1, published 20 December 2021.

**Which products and versions are affected?** github.com/concourse/concourse (Go) SEMVER:introduced=6.4.0,fixed=6.4.1; github.com/concourse/dex (Go) SEMVER:introduced=6.4.0,fixed=6.4.1.

**Is there a fix for CVE-2020-5415?** Yes. github.com/concourse/concourse (Go): upgrade to 6.4.1 or later; github.com/concourse/dex (Go): upgrade to 6.4.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-5415?** Check whether you run github.com/concourse/concourse (Go) or github.com/concourse/dex (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/concourse/concourse (Go): upgrade to 6.4.1 or later

  ```sh
  go get github.com/concourse/concourse@v6.4.1
  ```

- github.com/concourse/dex (Go): upgrade to 6.4.1 or later

  ```sh
  go get github.com/concourse/dex@v6.4.1
  ```


## Affected products

- github.com/concourse/concourse (Go) SEMVER:introduced=6.4.0,fixed=6.4.1
- github.com/concourse/dex (Go) SEMVER:introduced=6.4.0,fixed=6.4.1

## Identifiers

- CVE-2020-5415
- GHSA-627p-rr78-99rj

## Related threats

- [Concourse CI open redirect in login flow](https://junglewise.ai/threats/cve-2026-49826-concourse-ci-open-redirect-in-login-flow)
- [Team scope authorization bypass when Post/Put request with :team_name in body, allows HTTP parameter pollution](https://junglewise.ai/threats/cve-2022-31683-team-scope-authorization-bypass-when-post-put-request-with-team)
- [Pivotal Concourse SQL Injection Vulnerability](https://junglewise.ai/threats/cve-2019-3792-pivotal-concourse-sql-injection-vulnerability)
- [Pivotal Concourse Open Redirect in Login Flow](https://junglewise.ai/threats/cve-2018-15798-pivotal-concourse-open-redirect-in-login-flow)