What is CVE-2021-22223?

CVE-2021-22223 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-06.

How severe is CVE-2021-22223?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-22223 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in GitLab

CVE-2021-22223

Client-Side code injection through Feature Flag name in GitLab CE/EE starting with 11.9 allows a specially crafted feature flag name to PUT requests on behalf of other users via clicking on a link

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (59.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

GitLab — versions >=11.9, <13.11.6, >=13.12, <13.12.6, >=14.0, <14.0.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

n0-traces/cve_

References

gitlab.com/gitlab-org/gitlab/-/issues/293946 (Broken Link)
hackerone.com/reports/1059557 (Permissions Required)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22223.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-22223?: CVE-2021-22223 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-06.
How severe is CVE-2021-22223?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-22223 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.