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CVE-2026-83399 Critical · 9.8 EPSS 0.5%

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)

Oracle Corporation · Oracle WebLogic Server

Summary

A flaw in the Core component of Oracle WebLogic Server, part of Oracle Fusion Middleware, affects the server's handling of network requests over the T3 and IIOP protocols. An unauthenticated attacker with network access to those protocols can exploit it with low complexity and no user interaction to take over the Oracle WebLogic Server.

Official description · NVD

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).

Breakdown
17.3 / 100
Exploited
Not confirmed
Reports
0
Tactics
0/15

Disclosed on 20 Oct 2026. No public exploit code or confirmed exploitation is recorded.

techniques

No techniques linked

No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.

What security researchers reported

Not named in any threat report yet

Also mentioned in 6 community threat pulses (AlienVault OTX)

Weaker evidence

Pulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.

References

1 link, grouped by NVD tag

Other 1

oracle.com/security-alerts/cpuoct2026.html
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