# CVE-2026-91366: Oracle Siebel CRM Cloud Applications information disclosure and modification in Cloud Manager

Source: https://junglewise.ai/threats/cve-2026-91366-vulnerability-in-the-siebel-crm-cloud-applications-product-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91366 · Severity: medium · CVSS 4.7 · Published 2026-10-20

Oracle Siebel CRM Cloud Applications is a customer relationship management platform used by enterprises to manage sales and customer data. This vulnerability allows an attacker with physical access to the network segment where the system runs to read and modify customer data without authentication, potentially exposing or corrupting sensitive business information.

Technologies: [Oracle Siebel CRM Cloud Applications](https://junglewise.ai/threats/technologies/siebel-crm-cloud-applications). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91366 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91366 being exploited in the wild.

**How severe is CVE-2026-91366?** Medium severity, with a CVSS score of 4.7, published 20 October 2026.

**Which products and versions are affected?** Oracle Siebel CRM Cloud Applications 22.3-26.9.

**Is there a fix for CVE-2026-91366?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-91366 attacked?** It is attacked from the adjacent network, in a hosted service.

**Am I affected by CVE-2026-91366?** Check whether you run Oracle Siebel CRM Cloud Applications at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An adjacent-network privilege escalation vulnerability exists in the Siebel Cloud Manager component of Siebel CRM Cloud Applications. The vulnerability requires difficult exploitation conditions: an unauthenticated attacker must have physical access to the communication segment attached to the hardware executing the application. Successful exploitation results in unauthorized read access to a subset of data and unauthorized update, insert, or delete access to some data, with scope change indicating potential impact to other products.

## Affected products

- Oracle Siebel CRM Cloud Applications 22.3-26.9

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Siebel CRM information disclosure in Cloud Manager](https://junglewise.ai/threats/cve-2026-91371-vulnerability-in-the-siebel-crm-cloud-applications-product-of)
- [Oracle Siebel CRM information disclosure in Cloud Manager](https://junglewise.ai/threats/cve-2026-91370-vulnerability-in-the-siebel-crm-cloud-applications-product-of)
- [Oracle Siebel CRM data integrity tampering in Cloud Manager](https://junglewise.ai/threats/cve-2026-91369-vulnerability-in-the-siebel-crm-cloud-applications-product-of)
- [Oracle Siebel CRM unauthorized data access in Cloud Manager](https://junglewise.ai/threats/cve-2026-91368-vulnerability-in-the-siebel-crm-cloud-applications-product-of)
- [Oracle Siebel CRM Cloud Applications privilege escalation in Cloud Manager](https://junglewise.ai/threats/cve-2026-91367-vulnerability-in-the-siebel-crm-cloud-applications-product-of)