CVE-2025-4976: 
GitLab vulnerability analysis and mitigation

CVE-2025-4976 is an Improper Access Control vulnerability affecting GitLab Enterprise Edition (EE) that was discovered and patched in July 2025. The vulnerability affects all GitLab EE versions from 17.0 before 18.0.5, 18.1 before 18.1.3, and 18.2 before 18.2.1. This security issue was reported through GitLab's HackerOne bug bounty program by security researcher rogerace (GitLab Patch).

The vulnerability has been assigned a CVSS v3.1 score of 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N), indicating medium severity. Under certain circumstances, the vulnerability could allow an attacker to access internal notes in GitLab Duo responses. The issue specifically affects the Enterprise Edition of GitLab, demonstrating a weakness in access control mechanisms (GitLab Patch, GBHackers).

The vulnerability enables unauthorized access to internal notes within GitLab Duo responses, potentially exposing sensitive information to attackers. The impact is limited to GitLab Enterprise Edition installations, with the potential for information disclosure being the primary concern (GBHackers).

GitLab has released patches in versions 18.2.1, 18.1.3, and 18.0.5 to address this vulnerability. Organizations running affected versions are strongly recommended to upgrade immediately to one of these patched versions. GitLab.com is already running the patched version, and GitLab Dedicated customers do not need to take any action (GitLab Patch).