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CVE-2026-73951 – Unauthenticated Full System Compromise – Oracle WebCenter Portal 12.2.1.4.0 / 14.1.

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Summary

CVE-2026-73951 is a critical vulnerability in the Portlet Services component of Oracle WebCenter Portal (part of Oracle Fusion Middleware) that allows an unauthenticated, network-based attacker to completely compromise the affected system via HTTP. Oracle rates the flaw as difficult to exploit, but successful exploitation results in full loss of confidentiality, integrity, and availability. The vulnerability affects Oracle WebCenter Portal versions 12.2.1.4.0 and 14.1.2.0.0 and was disclosed by Oracle on September 15, 2026.

Technical details

  • Root cause: A flaw in the Portlet Services component of Oracle WebCenter Portal that can be leveraged to gain unauthorized control over the underlying system.
  • Trigger conditions: No authentication or user interaction is required to exploit the vulnerability; however, Oracle classifies the attack complexity as high, indicating that exploitation requires specific conditions or additional attacker effort beyond simply reaching the service.
  • Attack vector: Network — the vulnerable component is reachable over HTTP, making it exploitable remotely without local access.
  • Impact: Successful exploitation results in complete compromise of Oracle WebCenter Portal, with high impact to confidentiality, integrity, and availability of the affected system and the data it processes.

Affected software

  • Oracle WebCenter Portal 12.2.1.4.0
  • Oracle WebCenter Portal 14.1.2.0.0

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s September 2026 Critical Patch Update / Security Alert for the affected Oracle WebCenter Portal versions (12.2.1.4.0 and 14.1.2.0.0). Oracle strongly recommends applying the security patches as soon as possible.
  • If immediate patching is not possible: Restrict network exposure of Oracle WebCenter Portal Portlet Services to trusted networks only, and avoid exposing the portal’s HTTP interface directly to the internet until the patch has been applied. Monitor internet-facing WebCenter Portal instances closely for anomalous requests targeting portlet-related endpoints.

References

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