What is CVE-2021-39866?

CVE-2021-39866 is a medium-severity vulnerability in GitLab. CVSS score: 5.4/10. Published 2021-10-05.

How severe is CVE-2021-39866?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in GitLab

CVE-2021-39866

A business logic error in the project deletion process in GitLab 13.6 and later allows persistent access via project access tokens.

Published 2021-10-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

GitLab — versions 4.3.0, >=14.3, <14.3.1, >=14.2, <14.2.5

References

gitlab.com/gitlab-org/gitlab/-/issues/333175 (Broken Link)
hackerone.com/reports/1199561 (Permissions Required)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39866.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39866?: CVE-2021-39866 is a medium-severity vulnerability in GitLab. CVSS score: 5.4/10. Published 2021-10-05.
How severe is CVE-2021-39866?: Medium severity. CVSS v3 base score is 5.4 out of 10.