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CVE-2026-83078 – Unauthenticated Data Exposure and Modification – Oracle Siebel CRM Cloud Applicatio

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Summary

CVE-2026-83078 is a high-severity (CVSS 8.2) vulnerability in the Siebel Cloud Manager component of Oracle Siebel CRM Cloud Applications. It allows a remote, unauthenticated attacker with network access via HTTP to compromise the application, gaining unauthorized read access to critical data and unauthorized ability to update, insert, or delete a subset of application data. The flaw was disclosed by Oracle as part of its September 2026 Critical Security Patch Update.

Technical details

  • Root cause: An easily exploitable weakness in the Siebel Cloud Manager component of Siebel CRM Cloud Applications that fails to properly restrict access to application functionality/data.
  • Trigger conditions: No authentication or user interaction is required; the attacker only needs network access to the exposed HTTP interface.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), scope unchanged (S:U).
  • Impact: Successful exploitation can result in unauthorized access to critical data or complete access to all data accessible to Siebel CRM Cloud Applications, as well as unauthorized update, insert, or delete access to a subset of that data.

Affected software

  • Oracle Siebel CRM Cloud Applications, Siebel Cloud Manager component — versions 22.3 through 26.7

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s September 2026 Critical Security Patch Update for Oracle Siebel CRM. Oracle strongly recommends applying the update as soon as possible.
  • If immediate patching is not possible: Restrict network access to Siebel Cloud Manager interfaces to trusted management networks only, and monitor for unexpected data access or modification activity against Siebel CRM Cloud Applications until the patch can be applied. Oracle states it has not received reports of active exploitation as of the advisory release.

References

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