CVE-2026-73939 Missing authorization in Helidon

High 8.6 Published 18 Aug 2026 Updated 28 Aug 2026

Unauthenticated attackers can modify or delete critical data in Helidon Imperative Web Server via HTTP requests.

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-2026-73939?

CVE-2026-73939 is a high-severity missing authorization vulnerability in Oracle Helidon, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.19. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. While the vulnerability is in Helidon, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data. CVSS 3.1 Base Score 8.6 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N).

Weakness: CWE-284

Which versions are affected by CVE-2026-73939?

It affects 1 product.

Products include Oracle Helidon.

How do I fix CVE-2026-73939?

No fix has been published for CVE-2026-73939 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-73939 being exploited?

There is no known exploitation of CVE-2026-73939 in the wild and no public exploit code.

All Oracle Helidon vulnerabilities

Sources

Also known as GHSA-744q-589q-prch.