CVE-2025-6454: 
GitLab vulnerability analysis and mitigation

A Server-Side Request Forgery (SSRF) vulnerability has been identified in GitLab CE/EE, tracked as CVE-2025-6454. The vulnerability affects all versions from 16.11 before 18.1.6, 18.2 before 18.2.6, and 18.3 before 18.3.2. This security issue was discovered through GitLab's HackerOne bug bounty program and was publicly disclosed on September 10, 2025 (GitLab Release).

The vulnerability allows authenticated users to make unintended internal requests through proxy environments by injecting crafted sequences. The issue has been assigned a CVSS v3.1 base score of 8.5 (High), with the vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H. This indicates that while the attack requires network access and has high complexity, it can potentially lead to significant impact across confidentiality, integrity, and availability. The vulnerability is classified as CWE-918 (Server-Side Request Forgery) (NVD Database).

The vulnerability can result in high impact across three security aspects: confidentiality, integrity, and availability. When successfully exploited, it allows attackers to make unauthorized internal network requests, potentially exposing sensitive information and internal services. The changed scope (S:C) in the CVSS score indicates that the vulnerability can affect resources beyond the security scope of the vulnerable component (GitLab Release).

GitLab has released patches to address this vulnerability in versions 18.1.6, 18.2.6, and 18.3.2. Organizations are strongly recommended to upgrade to these patched versions immediately. GitLab.com has already been updated with the security fix, and GitLab Dedicated customers do not need to take any action. The patches are available through GitLab's standard update channels (GitLab Release).