CVE-2026-83379: 
Weblogic Server Proxy Plug-in for Apache HTTP Server vulnerability analysis and mitigation

CVE-2026-83379 is a vulnerability in the Oracle WebLogic Server Proxy Plug-In for Third-Party Web Servers, a component of Oracle Fusion Middleware. It affects versions 12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0 of the Oracle WebLogic Server Proxy Plug-in. The vulnerability was disclosed on October 20, 2026, as part of Oracle's October 2026 Critical Patch Update. It carries a CVSS v3.1 base score of 8.7 (High) (Oracle Advisory).

The vulnerability resides in the WebLogic Server Proxy Plug-In component used with third-party web servers (e.g., Apache HTTP Server or IIS). It is classified as a tampering vulnerability, allowing an unauthenticated attacker with network access via HTTP to compromise the plug-in. Exploitation is rated as "difficult" (high attack complexity), suggesting that specific conditions or timing may be required, though no user interaction or privileges are needed. The vulnerability has a changed scope, meaning successful exploitation can affect resources beyond the plug-in itself, potentially impacting the broader WebLogic Server environment (Oracle Advisory).

Successful exploitation can result in unauthorized creation, deletion, or modification of critical data accessible to the Oracle WebLogic Server Proxy Plug-in, as well as complete unauthorized read access to all data accessible by the plug-in. The changed scope indicates that additional Oracle products or components beyond the plug-in itself may be significantly impacted. Availability is not affected, but the combined high confidentiality and integrity impacts represent a serious risk to data security and system integrity (Oracle Advisory).

As of the disclosure date, there is no public proof-of-concept exploit and no evidence of active in-the-wild exploitation. The EPSS score is 0.0, reflecting a currently low probability of exploitation in the near term. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. The high attack complexity requirement reduces the immediate risk, though the unauthenticated network attack vector and high impact scores make it a priority for patching (Oracle Advisory).

Oracle has released patches for all affected versions (12.2.1.4.0, 14.1.1.0.0, and 14.1.2.0.0) as part of the October 2026 Critical Patch Update. Oracle strongly recommends applying the patches immediately. As a temporary measure, restricting network access to the WebLogic Server Proxy Plug-in to trusted sources only and monitoring for suspicious HTTP requests targeting the affected component can reduce risk. Reviewing and auditing access logs for unauthorized data creation, deletion, or modification activities is also advised (Oracle Advisory).