CVE-2023-6033: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-01 · updated 2026-06-17
Weakness: CWE-79

Description

Improper neutralization of input in Jira integration configuration in GitLab CE/EE, affecting all versions from 15.10 prior to 16.6.1, 16.5 prior to 16.5.3, and 16.4 prior to 16.4.3 allows attacker to execute javascript in victim's browser.

Affected products

GitLab: from 15.10 before 16.6.1; from 16.4.0 before 16.4.3; from 16.5.0 before 16.5.3 — fixed in 16.4.3, 16.5.3, 16.6.1

How to fix

Upgrade to a fixed version: GitLab 16.4.3, 16.5.3, 16.6.1. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/431201
https://hackerone.com/reports/2236039
https://gitlab.com/gitlab-org/gitlab/-/issues/431201
https://hackerone.com/reports/2236039

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