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CVE-2026-83202 – Unauthenticated Data Compromise (RCE-class) – Oracle Siebel CRM 17.0 through 26.7

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Summary

CVE-2026-83202 is a critical vulnerability in the Server Infrastructure component of Oracle Siebel CRM Deployment. It allows an unauthenticated attacker with network access via HTTP to compromise the system, resulting in unauthorized creation, deletion, or modification of critical data. Oracle rates the flaw 9.1 (Critical) and describes it as easily exploitable.

Technical details

  • Root cause lies in the Server Infrastructure component of Siebel CRM Deployment; Oracle’s advisory does not disclose further implementation-level detail.
  • The vulnerability is remotely exploitable over HTTP without authentication or any user interaction.
  • Attack complexity is low, and no privileges are required to exploit it.
  • Successful exploitation can result in unauthorized access to and unauthorized creation, deletion, or modification of critical data within the deployment.
  • Per Oracle’s CVSS vector, the impact affects confidentiality and integrity (both High) with no impact on availability.

Affected software

  • Oracle Siebel CRM Deployment, 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 / Security Alert (cspusep2026) for all Siebel CRM Deployment instances running versions 17.0 through 26.7.
  • If immediate patching is not possible: Restrict network access to Siebel CRM Deployment server infrastructure to trusted networks only, and monitor internet-facing Siebel endpoints closely until the patch can be applied.
  • Verify patch application against Oracle’s official advisory and confirm the deployed version no longer falls within the affected 17.0–26.7 range.

References

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