CVE-2026-73903: High 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 4.0.0-4.5.0. 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. CVSS 3.1 Base Score 7.5 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 4.5.1 are affected. An attacker needs network access to the service over HTTP.
Does exploitation require authentication or user interaction?
No. The vulnerability is described as easily exploitable by an unauthenticated attacker, with no user interaction required.
What could an attacker do after successful exploitation?
A successful attack can allow unauthorized creation, deletion, or modification of critical data or all data accessible through Helidon. The stated impact is integrity only; no confidentiality or availability impact is identified in the provided CVSS vector.