CVE-2026-83039 Auth bypass in Oracle WebCenter Portal

Critical 9.9 Published 15 Sep 2026 Updated 16 Sep 2026

A low-privileged attacker can bypass authentication to take over Oracle WebCenter Portal, impacting confidentiality, integrity, and availability.

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

What is CVE-2026-83039?

CVE-2026-83039 is a critical authentication bypass vulnerability in Oracle Webcenter Portal, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Composer). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle WebCenter Portal. While the vulnerability is in Oracle WebCenter Portal, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle WebCenter Portal. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).

Weakness: CWE-284

Which versions are affected by CVE-2026-83039?

It affects 1 product.

Products include Oracle Webcenter Portal.

How do I fix CVE-2026-83039?

No fix has been published for CVE-2026-83039 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-2026-83039 being exploited?

There is no known exploitation of CVE-2026-83039 in the wild and no public exploit code.

All Oracle Webcenter Portal vulnerabilities

Sources

Also known as GHSA-5xvv-9w25-q3fw.