What is CVE-2021-22220?

CVE-2021-22220 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-08.

How severe is CVE-2021-22220?

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

XSS in GitLab

CVE-2021-22220

An issue has been discovered in GitLab affecting all versions starting with 13.10. GitLab was vulnerable to a stored XSS in blob viewer of notebooks.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-08 · 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: 0.008 (54.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.8% 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: 0.008 · change: +0.001

Affected products

GitLab — versions >=13.12, <13.12.2, >=13.11, <13.11.5, >=13.10, <13.10.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitlab.com/gitlab-org/gitlab/-/issues/294128 (Broken Link)
hackerone.com/reports/1060114 (Permissions Required)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22220.json (Third Party Advisory)

Frequently asked questions

What is CVE-2021-22220?: CVE-2021-22220 is a medium-severity vulnerability in GitLab, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-06-08.
How severe is CVE-2021-22220?: Medium severity. CVSS v3 base score is 6.1 out of 10.