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CVE-2026-83355 – Unauthenticated RCE (Full Compromise) – Oracle Enterprise Manager for Fusion Middle

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Summary

CVE-2026-83355 is a critical vulnerability in the Metrics component of Oracle Enterprise Manager for Fusion Middleware that allows a remote, unauthenticated attacker to fully compromise the affected system over HTTP. Oracle rates the flaw as easily exploitable, and it carries a CVSS v3.1 base score of 9.8 (Critical). Successful exploitation results in complete loss of confidentiality, integrity, and availability of the Enterprise Manager deployment.

Technical details

  • Root cause: A flaw in the Metrics component of Oracle Enterprise Manager for Fusion Middleware that can be triggered through the product’s HTTP-accessible interfaces.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network access to the exposed HTTP endpoint used by the Metrics component.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Complete compromise of the Oracle Enterprise Manager for Fusion Middleware install, with high impact to confidentiality, integrity, and availability (C:H/I:H/A:H). Because Enterprise Manager typically has broad administrative visibility and control over managed Oracle infrastructure, a successful attack could give an intruder a foothold for further compromise of managed targets.

Affected software

  • Oracle Enterprise Manager for Fusion Middleware, version 13.5
  • Oracle Enterprise Manager for Fusion Middleware, version 24.1

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the Oracle security patch for Oracle Enterprise Manager for Fusion Middleware issued in Oracle’s September 2026 Critical Security Patch Update (CSPU), which addresses CVE-2026-83355. Organizations running version 13.5 or 24.1 should prioritize this update given the unauthenticated, network-exploitable nature of the flaw.
  • If immediate patching is not possible: Restrict network access to Oracle Enterprise Manager’s HTTP interfaces (e.g., via firewall rules, VPN, or network segmentation) so that only trusted management networks can reach the Metrics component, and monitor for anomalous or unauthenticated requests to Enterprise Manager endpoints until the patch can be applied.

References

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