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CVE-2026-83203 – Unauthenticated Data Exposure & Partial DoS – Oracle Siebel CRM End User (Open UI)

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Summary

CVE-2026-83203 is a high-severity vulnerability in the Open UI component of Oracle Siebel CRM End User that allows an unauthenticated, remote attacker to compromise the application over HTTP without any user interaction. Successful exploitation can grant complete access to Siebel CRM End User accessible data, allow unauthorized modification or deletion of some of that data, and cause a partial denial of service. Oracle rates this an "easily exploitable" vulnerability with a CVSS 3.1 base score of 8.6 (High).

Technical details

  • Root cause: A flaw in the Open UI component of Siebel CRM End User that fails to properly enforce authentication/authorization on functionality reachable over the network.
  • Trigger conditions: No authentication or privileges are required, and no user interaction is needed to exploit the flaw.
  • Attack vector: Network-based, delivered via HTTP directly against the exposed Siebel CRM End User application.
  • Impact: High confidentiality impact (potential complete access to all Siebel CRM End User accessible data), low integrity impact (unauthorized update, insert, or delete of some accessible data), and low availability impact (partial denial of service).

Affected software

  • Oracle Siebel CRM — Siebel CRM End User product, component Open UI
  • Supported versions 17.0 through 26.7

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s September 2026 Critical Patch Update (Oracle Security Alert, cspusep2026) for all affected Siebel CRM End User deployments running versions 17.0 through 26.7.
  • If patching cannot be applied immediately: Restrict direct network/HTTP exposure of the Siebel CRM Open UI interface to trusted networks (e.g., via VPN, firewall rules, or reverse proxy access controls) until the patch can be deployed, and monitor for anomalous unauthenticated access attempts against the Siebel Open UI endpoints.

References

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