CVE-2020-13270

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-06-10 · updated 2026-06-17
Weakness: CWE-862

Description

Missing permission check on fork relation creation in GitLab CE/EE 11.3 and later through 13.0.1 allows guest users to create a fork relation on restricted public projects via API

Affected products

GitLab: from 11.3.0 before 11.9.8; from 11.3.0 before 12.9.8; from 12.10.0 before 12.10.7; from 13.0.0 before 13.0.1 — fixed in 11.9.8, 12.10.7, 12.9.8, 13.0.1

How to fix

Upgrade to a fixed version: GitLab 11.9.8, 12.10.7, 12.9.8, 13.0.1. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13270.json
https://gitlab.com/gitlab-org/gitlab/-/issues/24648
https://hackerone.com/reports/419977
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13270.json
https://gitlab.com/gitlab-org/gitlab/-/issues/24648
https://hackerone.com/reports/419977

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