Oracle WebLogic Proxy Plug-in Path Traversal and Authentication Bypass

Aitor Fernández@aitorsbio

•updated Mar 26, 2026•2•0•123

Detects exploitation attempts of CVE-2026-21962 (Critical - CVSS 10.0) in Oracle WebLogic Server Proxy Plug-in. The vulnerability allows unauthenticated attackers to bypass access controls via path traversal (patterns like /_proxy/ or /wl_proxy/ + weblogic/..; + ProxyServlet) and header spoofing (WL-Proxy-Client-IP pointing to localhost/127.0.0.1). Successful exploitation can lead to unauthorized access, data modification or full compromise of the backend WebLogic Server.