What is CVE-2021-22256?

CVE-2021-22256 is a medium-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-08-25.

How severe is CVE-2021-22256?

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

Auth bypass in GitLab

CVE-2021-22256

Improper authorization in GitLab CE/EE affecting all versions since 12.6 allowed guest users to create issues for Sentry errors and track their status

Vulnerability class: Broken Access Control

Published 2021-08-25 · 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: 0.007 (52.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

GitLab — versions >=12.6, <13.12.9, >=14.0, <14.0.7, >=14.1, <14.1.2

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

gitlab.com/gitlab-org/gitlab/-/issues/326948 (Broken Link)
hackerone.com/reports/1117768 (Permissions Required, Third Party Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22256.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-22256?: CVE-2021-22256 is a medium-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-08-25.
How severe is CVE-2021-22256?: Medium severity. CVSS v3 base score is 5.4 out of 10.