{"id":75994,"date":"2025-09-19T10:01:26","date_gmt":"2025-09-19T10:01:26","guid":{"rendered":""},"modified":"2025-10-15T01:28:43","modified_gmt":"2025-10-15T07:28:43","slug":"cve-2025-6454-authenticated-user-exploit-in-gitlab-ce-ee-through-proxy-environments","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6454-authenticated-user-exploit-in-gitlab-ce-ee-through-proxy-environments\/","title":{"rendered":"CVE-2025-6454: Authenticated User Exploit in GitLab CE\/EE through Proxy Environments<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The GitLab CE\/EE environment has been discovered to have a notable vulnerability that could potentially compromise systems and lead to data leakage. This vulnerability, identified as CVE-2025-6454, affects multiple versions of the GitLab software, and its severity underscores the importance of immediate mitigation. This issue is particularly impactful as it targets a widely used platform, GitLab, which is a critical tool for developers worldwide. The far-reaching implications of this vulnerability make it a matter of paramount concern for cybersecurity professionals<\/a>, system administrators, and organizations that rely on GitLab for their operations.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-6454
\nSeverity: High (8.5 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: User
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

GitLab CE | 16.11-18.1.5, 18.2-18.2.5, 18.3-18.3.1
\nGitLab EE | 16.11-18.1.5, 18.2-18.2.5, 18.3-18.3.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability CVE-2025-6454 allows authenticated users to inject<\/a> carefully crafted sequences into the system through proxy environments. This exploitation can lead to unintended internal requests in the GitLab CE\/EE<\/a> environment that can potentially compromise the system or lead to data leakage. This vulnerability is especially concerning because the exploit<\/a> can be triggered by any authenticated user, not just those with higher-level privileges.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

The following is a
\nconceptual<\/strong>
\n example of how the vulnerability might be exploited. This example shows how an authenticated user might send a malicious payload to a vulnerable<\/a> endpoint in the GitLab environment.<\/p>\n

POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{\n\"injected_sequence\": \"Crafted sequence here...\"\n}<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
In order to mitigate this vulnerability<\/a>, it is recommended to apply the vendor patch as soon as possible. If immediate patching is not feasible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. However, these should only be considered as temporary solutions; applying the vendor patch should always be the ultimate goal to fully resolve the vulnerability<\/a>. Regularly updating software to the latest version is also a good preventive measure against such vulnerabilities<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The GitLab CE\/EE environment has been discovered to have a notable vulnerability that could potentially compromise systems and lead to data leakage. This vulnerability, identified as CVE-2025-6454, affects multiple versions of the GitLab software, and its severity underscores the importance of immediate mitigation. This issue is particularly impactful as it targets a widely used […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[102],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-75994","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-gitlab"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t