CVE-2026-91323
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Unauthenticated Remote Code Execution in Oracle WebLogic Server

Publication date: 2026-10-20

Last updated on: 2026-10-27

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 HTTP 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).

CVSS Scores

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Meta Information

Published
2026-10-20
Last Modified
2026-10-27
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91323
EUVD
EUVD-2026-106577

Affected Vendors & Products

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

This is a critical vulnerability in Oracle WebLogic Server where an unauthenticated attacker can remotely access and take over the server via HTTP. It affects versions 12.2.1.4.0 and later. The flaw allows full compromise of the system, including data confidentiality, integrity, and availability.

Detection Guidance

Detection requires checking for vulnerable Oracle WebLogic Server versions (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0). Inspect server logs for unusual HTTP requests or unauthorized access attempts. Use network scanning tools to identify WebLogic instances and verify patch levels.

Impact Analysis

If you use an affected Oracle WebLogic Server version, an attacker could gain complete control over your server. This could lead to data theft, system manipulation, or disruption of services. The high CVSS score indicates severe potential impact.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations must address it to maintain compliance and avoid penalties.

Mitigation Strategies

Apply the latest security patches from Oracle for affected WebLogic Server versions immediately. Disable unnecessary HTTP access and restrict network exposure to the server. Monitor for unusual activity and consider isolating the system until patched.

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