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CVE-2026-73953 – Unauthenticated RCE / Full Takeover – Oracle WebCenter Portal 12.2.1.4.0 & 14.1.2.0

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Summary

CVE-2026-73953 is a critical vulnerability in the Portlet Services component of Oracle WebCenter Portal (part of Oracle Fusion Middleware). It allows a completely unauthenticated, remote attacker over HTTP to fully compromise the affected application, with successful exploitation resulting in takeover of the Oracle WebCenter Portal instance. Oracle rates this as easily exploitable and has assigned it a maximum CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The flaw resides in the Portlet Services component of Oracle WebCenter Portal within Oracle Fusion Middleware.
  • Trigger conditions: No authentication or user interaction is required; the vulnerability is reachable over the network via HTTP.
  • Attack vector: Network (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N).
  • Impact: Successful exploitation results in complete compromise of confidentiality, integrity, and availability, with Oracle describing the outcome as full "takeover" of Oracle WebCenter Portal.

Affected software

  • Oracle WebCenter Portal 12.2.1.4.0
  • Oracle WebCenter Portal 14.1.2.0.0

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 fixes provided by Oracle in the September 2026 Critical Patch Update (CPU) for Oracle WebCenter Portal versions 12.2.1.4.0 and 14.1.2.0.0. Oracle strongly recommends applying security patches as soon as possible.
  • If patching cannot be applied immediately: Restrict network access to Oracle WebCenter Portal instances (e.g., via firewalls or network segmentation) to limit exposure to trusted networks only, and monitor HTTP traffic to WebCenter Portal Portlet Services endpoints for anomalous or unauthenticated requests until the patch can be deployed.

References

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