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Oracle is recommending customers patch a vulnerability in its Fusion Middleware stack that could let remote attackers compromise exposed systems through the WebLogic proxy layer.
The flaw affects proxy components that route web traffic to backend WebLogic servers, putting internet-facing and DMZ deployments at higher risk.
This vulnerability “… allows an unauthenticated attacker with network access via HTTP to compromise Oracle HTTP Server, Oracle Weblogic Server Proxy Plug-in,” said NIST in its advisory.
Affected WebLogic Proxy Versions and Risk
CVE-2026-21962 impacts Oracle Fusion Middleware environments that rely on the Oracle HTTP Server and WebLogic Server Proxy Plug-in to forward web traffic into backend application servers.
The affected versions include Oracle HTTP Server and proxy plug-ins 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0, as well as the WebLogic Server Proxy Plug-in for IIS on 12.2.1.4.0.
Because these components are often deployed as perimeter-facing gateways in DMZs, they are frequently exposed to untrusted networks and sit directly in the path of inbound HTTP requests.
Oracle said the vulnerability stems from a flaw in how the WebLogic proxy plug-ins process incoming requests at the proxy layer.
The issue is especially dangerous because it is remotely exploitable over HTTP, requires no authentication, and has low attack complexity, making it highly attractive to threat actors scanning for exposed middleware infrastructure.
If exploited successfully, Oracle’s disclosure indicates an attacker could gain unauthorized access to sensitive data and compromise system integrity by creating, deleting, or modifying data accessible through the Oracle HTTP Server.
There are no reports of exploitation in the wild and the vulnerability has a CVSS score of 10.0
How to Mitigate the WebLogic Proxy Vulnerability
Because this flaw is remotely exploitable and affects perimeter-facing proxy components, security teams should assume exposed systems may be targeted quickly.
The most effective response is rapid patching, backed by layered controls that reduce exposure, limit lateral movement, and improve detection.
- Apply Oracle’s patch for affected Oracle HTTP Server and WebLogic proxy plug-in versions as soon as possible.
- Restrict access to exposed HTTP ports and place proxy endpoints behind a WAF or reverse proxy to reduce direct attack surface.
- Enforce strong network segmentation between proxy hosts and backend WebLogic servers to limit pivoting and blast radius.
- Harden proxy servers by locking down admin access, removing unnecessary services, and requiring MFA for management interfaces.
- Increase monitoring and detection for suspicious proxy request patterns, anomalies, and unexpected proxy-to-backend behavior.
- Review and continuously validate external exposure to ensure proxy components are not unnecessarily internet-facing.
Combined, these measures help prevent proxy exposure from turning into a broader breach.
WebLogic Proxies Are Targets
The vulnerability is a reminder that proxy and gateway components can become direct compromise paths when they sit on the edge of enterprise environments.
Even without confirmed exploitation, unauthenticated access and a CVSS 10.0 score make patching and exposure reduction urgent for affected WebLogic proxies.
Teams should patch quickly, tighten perimeter access, and validate segmentation to prevent proxy-layer pivoting into backend systems.
These risks highlight why zero-trust strategies are important for protecting high-value systems and access paths.
