What is CVE-2021-22171?

CVE-2021-22171 is a high-severity vulnerability in GitLab, classified under Improper Authentication. CVSS score: 7.3/10. Published 2021-01-15.

How severe is CVE-2021-22171?

High severity. CVSS v3 base score is 7.3 out of 10.

Auth bypass in GitLab

CVE-2021-22171

Insufficient validation of authentication parameters in GitLab Pages for GitLab 11.5+ allows an attacker to steal a victim's API token if they click on a maliciously crafted link

Vulnerability class: Broken Authentication

Published 2021-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.013 (70.2th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

GitLab — versions >=11.5.0, <13.5.6, >=13.6.0, <13.6.4, >=13.7.0, <13.7.2

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

gitlab.com/gitlab-org/gitlab-pages/-/issues/262 (Broken Link)
hackerone.com/reports/718460 (Permissions Required, Third Party Advisory)
gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22171.json (Vendor Advisory)

Frequently asked questions

What is CVE-2021-22171?: CVE-2021-22171 is a high-severity vulnerability in GitLab, classified under Improper Authentication. CVSS score: 7.3/10. Published 2021-01-15.
How severe is CVE-2021-22171?: High severity. CVSS v3 base score is 7.3 out of 10.