What is CVE-2021-39886?

CVE-2021-39886 is a low-severity vulnerability in GitLab, classified under Incorrect Default Permissions. CVSS score: 2.6/10. Published 2021-10-05.

How severe is CVE-2021-39886?

Low severity. CVSS v3 base score is 2.6 out of 10.

Vulnerability in GitLab

CVE-2021-39886

Permissions rules were not applied while issues were moved between projects of the same group in GitLab versions starting with 10.6 and up to 14.1.7 allowing users to read confidential Epic references.

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

CVSS v3 metric

CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

GitLab — versions >=10.6, <14.1.7, >=14.2, <14.2.5, >=14.3, <14.3.1

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

gitlab.com/gitlab-org/gitlab/-/issues/330520 (Broken Link)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39886.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39886?: CVE-2021-39886 is a low-severity vulnerability in GitLab, classified under Incorrect Default Permissions. CVSS score: 2.6/10. Published 2021-10-05.
How severe is CVE-2021-39886?: Low severity. CVSS v3 base score is 2.6 out of 10.