An issue has been discovered in GitLab affecting versions starting from 15.1 before 15.8.5, 15.9 before 15.9.4, and 15.10 before 15.10.1. A maintainer could modify a webhook URL to leak masked webhook secrets by adding a new parameter to the url. This addresses an incomplete fix for CVE-2022-4342.
https://hackerone.com/reports/1871136
https://gitlab.com/gitlab-org/gitlab/-/issues/391685
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0838.json