# CVE-2026-91359: Oracle Siebel CRM unauthorized data access in Siebel Cloud Manager

Source: https://junglewise.ai/threats/cve-2026-91359-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-2026-91359 · Severity: medium · CVSS 5.3 · Published 2026-10-20

Oracle Siebel CRM is a cloud-based customer relationship management platform used by enterprises to manage customer interactions and business processes. An unauthenticated attacker on the network can exploit an easily exploitable vulnerability in Siebel Cloud Manager to read sensitive data from the system without proper authorization, potentially exposing customer records and 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-2026-91359 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91359 being exploited in the wild.

**How severe is CVE-2026-91359?** Medium severity, with a CVSS score of 5.3, published 20 October 2026.

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

**Is there a fix for CVE-2026-91359?** 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-2026-91359 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-91359?** 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 easily exploitable vulnerability in the Siebel Cloud Manager component allows unauthenticated attackers with network access via HTTP to read a subset of Siebel CRM Cloud Applications data. The vulnerability requires no user interaction, no special privileges, and no authentication, making it straightforward to exploit remotely. Successful exploitation results in unauthorized disclosure of confidential information stored in the CRM system.

## Affected products

- Oracle Siebel CRM Cloud Applications 22.3 through 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)