CVE-2021-22171

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-15 · updated 2026-06-17
Weakness: CWE-287

Description

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

Affected products

GitLab: from 11.5.0 before 13.5.6; from 13.6.0 before 13.6.4; from 13.7.0 before 13.7.2 — fixed in 13.5.6, 13.6.4, 13.7.2

How to fix

Upgrade to a fixed version: GitLab 13.5.6, 13.6.4, 13.7.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22171.json
https://gitlab.com/gitlab-org/gitlab-pages/-/issues/262
https://hackerone.com/reports/718460
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22171.json
https://gitlab.com/gitlab-org/gitlab-pages/-/issues/262
https://hackerone.com/reports/718460

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