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CVE-2026-73924 – Unauthenticated Data Tampering / RCE-class Compromise – Oracle Helidon (Imperative

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Summary

CVE-2026-73924 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon, a Java framework used to build microservices. The flaw allows an unauthenticated attacker with network access via HTTP to compromise the affected Helidon deployment, gaining the ability to create, delete, or modify critical data as well as read all accessible information. Oracle rates the issue CRITICAL with a CVSS v3.1 base score of 9.1.

Technical details

  • Root cause: The vulnerability resides in Helidon’s Imperative Web Server component; Oracle’s advisory describes it as "easily exploitable," implying no complex preconditions or specialized attacker skill are required.
  • Trigger conditions: No authentication or user interaction is required to exploit the flaw.
  • Attack vector: Remote, over the network via standard HTTP requests to the exposed Helidon web server.
  • Impact: Successful exploitation grants unauthorized creation, deletion, or modification of critical data, along with unrestricted read access to data accessible via the vulnerable component. The CVSS vector indicates high confidentiality and integrity impact with no availability impact (C:H/I:H/A:N).

Affected software

  • Oracle Helidon, Imperative Web Server component — version 1.4.19

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Apply the Oracle patch released in the Critical Security Patch Update for August 2026. Organizations running the affected Imperative Web Server version should upgrade to a fixed Helidon release identified in Oracle’s advisory as soon as possible.
  • If patching cannot be performed immediately: Restrict direct network/HTTP exposure of Helidon-based services (e.g., place behind an authenticated reverse proxy or restrict access via firewall/network segmentation) until the patch can be applied, since the vulnerability is remotely exploitable without authentication.
  • Review affected services for any signs of unauthorized data creation, modification, or deletion that may indicate prior exploitation.

References

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