CVE-2023-0838

Severity: low (CVSS 3.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-05 · updated 2026-06-17
Weakness: CWE-200

Description

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.

Affected products

GitLab: from 15.1.0 before 15.8.5; from 15.9.0 before 15.9.4; 15.10.0 — fixed in 15.8.5, 15.9.4

How to fix

Upgrade to a fixed version: GitLab 15.8.5, 15.9.4. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0838.json
https://gitlab.com/gitlab-org/gitlab/-/issues/391685
https://hackerone.com/reports/1871136
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0838.json
https://gitlab.com/gitlab-org/gitlab/-/issues/391685
https://hackerone.com/reports/1871136

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