Is CVE-2026-83399 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-83399 being exploited in the wild.

How severe is CVE-2026-83399?

Critical severity, with a CVSS score of 9.8, published 20 October 2026.

Which products and versions are affected?

Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0.

Is there a fix for CVE-2026-83399?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-83399 attacked?

It is attacked over the network, in a hosted service.

Am I affected by CVE-2026-83399?

Check whether you run Oracle WebLogic Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-83399: Oracle WebLogic Server remote code execution in Core

CVE-2026-83399 · Severity: critical · CVSS 9.8 · Published 2026-10-20

Oracle WebLogic Server is an application server that runs enterprise Java applications for businesses. An unauthenticated attacker on the network can exploit a flaw in the Core component to gain complete control of the server, compromising all data, applications, and services running on it. The vulnerability can be exploited remotely without authentication via T3 or IIOP protocols.

Technologies: Oracle WebLogic Server. Vendors: Oracle.

Quick answers

Is CVE-2026-83399 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-83399 being exploited in the wild.
How severe is CVE-2026-83399?: Critical severity, with a CVSS score of 9.8, published 20 October 2026.
Which products and versions are affected?: Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0.
Is there a fix for CVE-2026-83399?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-83399 attacked?: It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-83399?: Check whether you run Oracle WebLogic Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An easily exploitable vulnerability in Oracle WebLogic Server Core component allows unauthenticated remote code execution via T3 or IIOP protocols. The vulnerability requires only network access with no authentication, user interaction, or complex conditions, allowing an attacker to achieve complete server compromise. A patch is expected from Oracle.

Affected products

Oracle WebLogic Server 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0

Timeline

2026-10-20: disclosed

References

https://www.oracle.com/security-alerts/cpuoct2026.html

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.