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CVE-2026-73917 – Unauthenticated Data Modification/Disclosure – Oracle Helidon 4.5.0 (Imperative Web

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Summary

CVE-2026-73917 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon. It allows an unauthenticated, remote attacker with network access via HTTP to gain unauthorized access to Helidon, resulting in the ability to create, delete, or modify critical data as well as gain complete read access to all data accessible by the application. Oracle rates the flaw as CRITICAL with a CVSS v3.1 base score of 9.1.

Technical details

  • Root cause: A flaw in the Imperative Web Server component of Oracle Helidon permits requests to reach protected resources/operations without proper authentication or authorization enforcement.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network-level (HTTP) access to a Helidon deployment running the affected component.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: High confidentiality impact and high integrity impact — attackers can read all Helidon-accessible data and create/modify/delete critical data. No direct availability impact is noted (A:N).
  • Oracle’s advisory groups this issue among vulnerabilities that "may be remotely exploitable without authentication," underscoring its suitability for automated, internet-wide exploitation attempts.

Affected software

  • Oracle Helidon, Imperative Web Server component — version 4.5.0

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 fix supplied in Oracle’s August 2026 Critical Patch Update (CPU). Organizations running Helidon 4.5.0 should upgrade to the version designated by Oracle as patched for this issue in the same advisory and confirm the applied patch level against Oracle’s published risk matrix.
  • If immediate patching is not possible: Restrict network exposure of Helidon-based services (e.g., place them behind an authenticating reverse proxy, VPN, or firewall rules limiting access to trusted networks only) until the patch can be applied, and monitor HTTP access logs for anomalous unauthenticated requests to sensitive endpoints.
  • Review all internet-facing Helidon deployments to confirm the exact version in use, as Oracle’s CPU bulletins bundle multiple Helidon fixes across different version lines.

References

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