CVE-2026-73866: Critical severity Oracle Helidon (Imperative Web Server) vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
Affected Software
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Helidon deployments using the Imperative Web Server component on supported version 4.5.0 are affected. The attacker only needs network access to the target over HTTP.
Does exploitation require authentication or user interaction?
No. The vulnerability is described as easily exploitable by an unauthenticated attacker, and the CVSS vector indicates no privileges or user interaction are required.
What could a successful attacker do?
A successful attack can provide unauthorized access to critical data or all data accessible to Helidon, and can allow creation, deletion, or modification of critical data or all Helidon-accessible data.