CVE-2026-61040 Auth bypass in Oracle WebCenter Sites

High 8.8 Published 18 Aug 2026 Updated 20 Aug 2026

A low-privileged attacker can bypass authentication to take over Oracle WebCenter Sites via HTTP.

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-2026-61040?

CVE-2026-61040 is a high-severity authentication bypass vulnerability in Oracle Webcenter Sites, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Vulnerability in the Oracle WebCenter Sites product of Oracle Fusion Middleware (component: WebCenter Sites). 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 Sites. Successful attacks of this vulnerability can result in takeover of Oracle WebCenter Sites. CVSS 3.1 Base Score 8.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-284

Which versions are affected by CVE-2026-61040?

It affects 1 product.

Products include Oracle Webcenter Sites.

How do I fix CVE-2026-61040?

No fix has been published for CVE-2026-61040 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-2026-61040 being exploited?

There is no known exploitation of CVE-2026-61040 in the wild and no public exploit code.

All Oracle Webcenter Sites vulnerabilities

Sources

Also known as GHSA-m4mc-xxgp-289v.