CVE-2026-73873: Medium severity Oracle Helidon vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.17. Difficult to exploit vulnerability allows low privileged attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Helidon accessible data as well as unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 4.2 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Because Helidon (Imperative Web Server) is exposed via HTTP and can be exploited remotely, restrict network access to the Helidon HTTP endpoint (e.g., limit inbound access to trusted networks/hosts via firewall/ACL) to reduce exposure.
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Deployments using Oracle Helidon Imperative Web Server version 3.2.18 are affected. Exploitation requires network access to the service over HTTP and an existing low-privileged account.
What could a successful attacker do?
A successful attacker could obtain unauthorized read access to a subset of Helidon-accessible data and unauthorized update, insert, or delete access to some Helidon-accessible data. The vulnerability has no stated availability impact.
Is this likely to be exploited opportunistically?
The vulnerability is rated as difficult to exploit, with high attack complexity. However, it can be exploited remotely over HTTP without user interaction once the attacker has low-privileged access.