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CVE-2026-73889 Oracle CVE debrief

The CVE-2026-73889 vulnerability is in the Imperative Web Server component of the Helidon product in Oracle Fusion Middleware. The affected version is 4.5.0. This vulnerability is easily exploitable by an unauthenticated attacker with network access via HTTP, potentially leading to unauthorized read access to a subset of Helidon accessible data. Security teams should review the CVE record and apply necessary patches or mitigations. The CVSS 3.1 score is 5.3, indicating a medium severity. Helidon installations, particularly those using version 4.5.0, are at risk. The vulnerability allows an attacker to compromise Helidon, leading to potential data breaches.

Vendor
Oracle
Product
Helidon
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-18
Original CVE updated
2026-08-24
Advisory published
2026-08-18
Advisory updated
2026-08-24

Who should care

Security teams and administrators responsible for Oracle Fusion Middleware and Helidon installations, particularly those using version 4.5.0, should review and apply the necessary patches or mitigations. They should also inventory checks for Helidon version 4.5.0 and assess exposure. Implementing compensating controls to monitor and restrict access to Helidon is also recommended.

Technical summary

The CVE-2026-73889 vulnerability is in the Imperative Web Server component of the Helidon product in Oracle Fusion Middleware. The affected version is 4.5.0. This vulnerability is easily exploitable by an unauthenticated attacker with network access via HTTP, potentially leading to unauthorized read access to a subset of Helidon accessible data. The CVSS 3.1 score is 5.3, with Confidentiality impacts. Security teams and administrators should review and apply necessary patches or mitigations.

Defensive priority

Medium priority given the CVSS score of 5.3 and the potential for unauthorized read access to Helidon data.

Recommended defensive actions

  • Review and apply the vendor advisory from Oracle for CVE-2026-73889
  • Inventory checks for Helidon version 4.5.0 and assess exposure
  • Implement compensating controls to monitor and restrict access to Helidon
  • Review CVE Program record for official CVE metadata
  • Check NVD detail page for source-specific vulnerability assessment
  • Track exceptions and retest remediated assets
  • Plan vendor-supported updates or mitigations through normal change control

Evidence notes

The CVE-2026-73889 record indicates a vulnerability in the Helidon product of Oracle Fusion Middleware. The supported version affected is 4.5.0. The vulnerability allows an unauthenticated attacker with network access via HTTP to compromise Helidon, potentially leading to unauthorized read access to a subset of Helidon accessible data. The CVSS 3.1 Base Score is 5.3, indicating a medium severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-73889 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-73889

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-73889 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-73889

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.