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CVE-2026-83154 – Unauthenticated Data Compromise via SOAP – Oracle Siebel CRM End User (Open UI) 17.

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Summary

CVE-2026-83154 is a critical vulnerability in the Open UI component of the Siebel CRM End User product within Oracle Siebel CRM. It allows an unauthenticated attacker with network access via SOAP to compromise the application, resulting in unauthorized creation, deletion, or modification of critical data. Oracle rates this issue 9.1 (Critical) on the CVSS v3.1 scale.

Technical details

  • Root cause: A flaw in the Open UI component of the Siebel CRM End User product that permits unauthorized data access and manipulation without proper authentication or access control checks.
  • Trigger conditions: The vulnerability is reachable by sending SOAP requests to the affected Siebel CRM End User interface; no valid credentials or prior authentication are required.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction required (UI:N).
  • Impact: Successful exploitation can result in unauthorized creation, deletion, or modification of critical data, and unauthorized access to critical or all Siebel CRM End User–accessible data. There is no impact to availability.

Affected software

  • Oracle Siebel CRM — Siebel CRM End User product (Open UI component), supported versions 17.0 through 26.7.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s September 2026 Critical Patch Update advisory for Siebel CRM End User versions 17.0–26.7. Organizations should update to the version specified in the corresponding Oracle patch as soon as possible.
  • If patching cannot be performed immediately: Restrict network exposure of Siebel CRM SOAP endpoints to trusted networks only (e.g., via firewall rules or VPN access), monitor SOAP traffic to Siebel CRM End User interfaces for anomalous or unauthenticated requests, and review access logs for signs of unauthorized data modification or exfiltration.

References

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