Auth bypass in GitLab
CVE-2021-39916
Lack of an access control check in the External Status Check feature allowed any authenticated user to retrieve the configuration of any External Status Check in GitLab EE starting from 14.1 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.008 (55.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- GitLab — versions >=14.1, <14.3.6, >=14.4, <14.4.4, >=14.5, <14.5.2
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/issues/343379 (Broken Link)
- hackerone.com/reports/1372216 (Permissions Required, Third Party Advisory)
- gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39916.json (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-39916?
- CVE-2021-39916 is a medium-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2021-12-13.
- How severe is CVE-2021-39916?
- Medium severity. CVSS v3 base score is 4.3 out of 10.