CVE-2026-83021 Auth bypass in Oracle WebLogic Server

Critical 10.0 Published 15 Sep 2026 Updated 17 Sep 2026

Unauthenticated attackers can bypass authentication to take over Oracle WebLogic Server via HTTP, leading to full system compromise.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-83021?

CVE-2026-83021 is a critical authentication bypass vulnerability in Oracle Weblogic Server, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle WebLogic Server. While the vulnerability is in Oracle WebLogic Server, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.1 Base Score 10.0 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Weakness: CWE-306, CWE-287

Which versions are affected by CVE-2026-83021?

It affects 1 product.

Products include Oracle Weblogic Server.

How do I fix CVE-2026-83021?

No fix has been published for CVE-2026-83021 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-83021 being exploited?

There is no known exploitation of CVE-2026-83021 in the wild and no public exploit code.

All Oracle Weblogic Server vulnerabilities

Sources

Also known as GHSA-g2wh-mcrv-5m76.