CVE-2026-83040 Auth bypass in Oracle WebCenter Portal

Critical 9.6 Published 15 Sep 2026 Updated 16 Sep 2026

Unauthenticated attackers can compromise Oracle WebCenter Portal via SOAP, leading to full system takeover.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-83040?

CVE-2026-83040 is a critical authentication bypass vulnerability in Oracle Webcenter Portal, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Vulnerability in the Oracle WebCenter Portal product of Oracle Fusion Middleware (component: Portlet Services). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via SOAP to compromise Oracle WebCenter Portal. Successful attacks require human interaction from a person other than the attacker and 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 9.6 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H).

Weakness: CWE-284

Which versions are affected by CVE-2026-83040?

It affects 1 product.

Products include Oracle Webcenter Portal.

How do I fix CVE-2026-83040?

No fix has been published for CVE-2026-83040 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-2026-83040 being exploited?

There is no known exploitation of CVE-2026-83040 in the wild and no public exploit code.

All Oracle Webcenter Portal vulnerabilities

Sources

Also known as GHSA-4rq9-76h3-6w88.