CVE-2020-26406

Severity: medium (CVSS 5.3 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: 2020-11-17 · updated 2026-06-17

Description

Certain SAST CiConfiguration information could be viewed by unauthorized users in GitLab EE starting with 13.3. This information was exposed through GraphQL to non-members of public projects with repository visibility restricted as well as guest members on private projects. Affected versions are: >=13.3, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.

Affected products

GitLab: from 13.3.0 before 13.3.9; from 13.4.0 before 13.4.5; from 13.5.0 before 13.5.2 — fixed in 13.3.9, 13.4.5, 13.5.2

How to fix

Upgrade to a fixed version: GitLab 13.3.9, 13.4.5, 13.5.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26406.json
https://gitlab.com/gitlab-org/gitlab/-/issues/244921
https://hackerone.com/reports/965602
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26406.json
https://gitlab.com/gitlab-org/gitlab/-/issues/244921
https://hackerone.com/reports/965602

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