CVE-2020-13300

Severity: critical (CVSS 10.0 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: 2020-09-14 · updated 2026-06-17
Weakness: CWE-863

Description

GitLab CE/EE version 13.3 prior to 13.3.4 was vulnerable to an OAuth authorization scope change without user consent in the middle of the authorization flow.

Affected products

GitLab: from 13.3.0 before 13.3.4 — fixed in 13.3.4

How to fix

Upgrade to a fixed version: GitLab 13.3.4. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13300.json
https://gitlab.com/gitlab-org/gitlab/-/issues/219931
https://hackerone.com/reports/884766
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13300.json
https://gitlab.com/gitlab-org/gitlab/-/issues/219931
https://hackerone.com/reports/884766

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