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CVE-2026-73931 – Unauthenticated Data Manipulation & Partial DoS – Oracle Helidon 4.5.3 (Imperative

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Summary

CVE-2026-73931 is a high-severity (CVSS 8.3) vulnerability affecting the Imperative Web Server component of Oracle Helidon. The flaw allows a remote, unauthenticated attacker with network access via HTTP to gain unauthorized read access as well as insert, update, and delete access to some Helidon-accessible data, and can also cause a partial denial of service. Because the vulnerability has a CVSS scope change (S:C), a successful attack against Helidon may impact resources beyond the vulnerable component itself.

Technical details

  • Root cause: A flaw in the Imperative Web Server component of Oracle Helidon that fails to properly restrict access to data operations exposed over HTTP.
  • Trigger conditions: An attacker needs only network access to the exposed Helidon HTTP endpoint — no authentication and no user interaction are required to exploit the flaw.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Unauthorized read access to data, unauthorized insert/update/delete of some Helidon-accessible data, and partial denial of service; the CVSS scope change indicates the impact may extend to components beyond the vulnerable server itself.

Affected software

  • Oracle Helidon version 4.5.3

Severity

  • CVSS v3.1 Base Score: 8.3 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Mitigation and recommended actions

  • Immediate: Apply the fix provided by Oracle for this vulnerability, released as part of the Oracle Critical Security Patch Update (CSPU) for August 2026. Organizations running Oracle Helidon 4.5.3 should upgrade to the version specified in Oracle’s August 2026 security alert as soon as possible.
  • If patching cannot be performed immediately: Restrict network exposure of the Helidon Imperative Web Server component to trusted networks only (e.g., via firewall rules, network segmentation, or placing it behind an authenticated reverse proxy/gateway) until the patch can be applied, since the vulnerability requires only network access and no authentication to exploit.
  • Monitor Helidon-exposed HTTP endpoints for unexpected data modification requests or anomalous traffic patterns as an interim detection measure.

References

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