CVE-2026-83399

Analyzed Analyzed - Analysis Complete

Oracle WebLogic Server Remote Code Execution

Publication date: 2026-10-20

Last updated on: 2026-11-05

Assigner: Oracle

Description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

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Meta Information

Published

2026-10-20

Last Modified

2026-11-05

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-83399

EUVD

EUVD-2026-106317

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	weblogic_server	12.2.1.4.0
oracle	weblogic_server	14.1.1.0.0
oracle	weblogic_server	14.1.2.0.0
oracle	weblogic_server	15.1.1.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

This is a critical vulnerability in Oracle WebLogic Server that allows unauthenticated attackers to remotely compromise the server via network access using T3 or IIOP protocols. Successful exploitation can lead to full takeover of the affected server.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable Oracle WebLogic Server versions. Use commands like 'curl -v http://<target>:7001/console' or 'nmap -p 7001 <target> --script oracle-weblogic-t3-info' to identify exposed instances. Verify installed versions with 'java -jar wls.jar -version' if you have access.

Impact Analysis

If you use Oracle WebLogic Server versions 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, or 15.1.1.0.0, an attacker could gain complete control over your server, leading to data breaches, service disruption, or further network compromise.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face legal penalties and compliance violations if exploited.

Mitigation Strategies

Immediately apply Oracle's security patches for affected WebLogic versions. If patching is not possible, restrict network access to T3 and IIOP ports (default 7001, 7002) via firewalls. Disable unnecessary services and monitor for unusual activity.

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