CVE-2025-0475

CVE-2025-0475 is a cross-site scripting (XSS) vulnerability, classified under CWE-79, in the proxy feature of GitLab Community Edition (CE) and Enterprise Edition (EE). It affects all versions from 15.10 prior to 17.7.6, 17.8 prior to 17.8.4, and 17.9 prior to 17.9.1. The issue arises from unintended content rendering under specific circumstances, with a CVSS v3.1 base score of 8.7 (AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N), indicating high severity due to network accessibility, low attack complexity, and significant impacts on confidentiality and integrity.

An authenticated user with low privileges can exploit this vulnerability over the network by crafting malicious content that leverages the proxy feature. Exploitation requires user interaction, such as a victim clicking or interacting with the rendered content, leading to XSS execution in the context of the changed scope. Successful attacks can result in high confidentiality and integrity impacts, potentially allowing attackers to steal sensitive data or manipulate the victim's session.

Mitigation involves upgrading to GitLab versions 17.7.6, 17.8.4, or 17.9.1 or later, as indicated by the affected version ranges. Additional details are available in the GitLab issue tracker at https://gitlab.com/gitlab-org/gitlab/-/issues/513142 and the HackerOne disclosure report at https://hackerone.com/reports/2932309.