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CVE-2026-83201 – Unauthenticated Data Compromise (RCE-class) – Oracle Siebel CRM Deployment 17.0–26.

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Summary

CVE-2026-83201 is a critical vulnerability in the Server Infrastructure component of Oracle Siebel CRM Deployment. It allows a remote, unauthenticated attacker with HTTP access to the application to compromise the system, resulting in unauthorized access to and modification of critical data. Oracle rates the issue 9.1 (Critical) and disclosed it as part of the September 2026 Critical Patch Update.

Technical details

  • Root cause: a flaw in the Server Infrastructure component of Siebel CRM Deployment that is reachable over HTTP.
  • Trigger conditions: exploitation does not require authentication or user interaction, and Oracle classifies the attack complexity as low ("easily exploitable").
  • Attack vector: network, via HTTP requests to the Siebel CRM Deployment server infrastructure.
  • Impact: high confidentiality and integrity impact — unauthorized access, creation, deletion, or modification of data accessible to the application. Oracle notes availability is not impacted, and the scope is unchanged.

Affected software

  • Oracle Siebel CRM Deployment, Server Infrastructure component — 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 for Siebel CRM Deployment (versions 17.0–26.7 are affected). Oracle strongly recommends applying the patch as soon as possible.
  • If immediate patching is not possible: Restrict network/HTTP access to Siebel CRM Deployment infrastructure to trusted networks only, and monitor exposed Siebel endpoints for anomalous unauthenticated requests until the patch can be applied.

References

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