CVE-2021-4191
MediumExploitedPrivate GitLab instances with restricted sign-ups may be vulnerable to user enumeration to unauthenticated users through the GraphQL API.
Published Mar 28, 2022 · Updated Sep 8, 2026 · Also known as BIT-gitlab-2021-4191, UBUNTU-CVE-2021-4191
Key Facts
Patch immediately- CVE-2021-4191 is a medium-severity vulnerability (CVSS 5.3 v3.1) affecting GitLab.
- It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 17, 2023. No public exploit code is known.
- EPSS estimates a 80% probability of exploitation in the next 30 days.
- Fixed versions are available, including GitLab 14.6.5, GitLab 14.7.4, GitLab 14.8.2.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS (30-day exploit likelihood)
80%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
2 catalog listings
Public exploit code
None known
Get the full CVE-2021-4191 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 14, 2023 | n/a | Not reported |
| CIRCL KEV | Oct 17, 2023 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| GitLabGitlab | >= 13.0.0, >= >=14.8, <14.8.2 | 14.6.5 |
Patched Releases
GitLab
14.6.5, 14.7.4, 14.8.2, 15.10.8+ds1-2
Timeline
Publicly disclosed
Mar 28, 2022
Added to CIRCL KEV
Oct 17, 2023
Added to Industry KEV feed
Nov 14, 2023
Last updated
Sep 8, 2026
References
- advisoryhttps://about.gitlab.com/releases/2022/02/25/critical-security-release-gitlab-14-8-2-released/
- advisoryhttps://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-4191.json
- advisoryhttps://hackerone.com/reports/1089609
- advisoryhttps://ubuntu.com/security/CVE-2021-4191
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2021-4191
FAQ
Common Questions.
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.
Affected: GitLab versions >= 13.0.0, >= >=14.8, <14.8.2. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed, CIRCL KEV since Oct 17, 2023.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including GitLab 14.6.5, GitLab 14.7.4, GitLab 14.8.2.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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