# CVE-2026-91432: Oracle Siebel CRM End User unauthorized data access in Open UI

Source: https://junglewise.ai/threats/cve-2026-91432-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel  
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-2026-91432 · Severity: medium · CVSS 6.5 · Published 2026-10-20

Oracle Siebel CRM End User, a customer relationship management platform used by businesses to manage customer interactions, contains a vulnerability in its Open UI component that allows unauthenticated network attackers to read, modify, insert, or delete customer data without authorization. An attacker with network access can exploit this remotely via HTTP, potentially leading to data breaches or data corruption affecting customer records and business operations.

Technologies: [Oracle Siebel CRM End User](https://junglewise.ai/threats/technologies/siebel-crm-end-user). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91432 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91432 being exploited in the wild.

**How severe is CVE-2026-91432?** Medium severity, with a CVSS score of 6.5, published 20 October 2026.

**Which products and versions are affected?** Oracle Siebel CRM End User 17.0-26.9.

**Is there a fix for CVE-2026-91432?** 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-2026-91432 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-91432?** Check whether you run Oracle Siebel CRM End User 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

This is an easily exploitable authorization bypass vulnerability in Siebel CRM End User's Open UI component. An unauthenticated attacker with network access can send HTTP requests to compromise the application and gain unauthorized read, insert, update, and delete access to accessible data. The vulnerability requires no user interaction, authentication, or special configuration to exploit.

## Affected products

- Oracle Siebel CRM End User 17.0-26.9

## 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 End User unauthorized data access in Communications Panel](https://junglewise.ai/threats/cve-2026-91445-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User unauthorized data access in Open UI](https://junglewise.ai/threats/cve-2026-91431-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User Cross-Site Request Forgery in Open UI](https://junglewise.ai/threats/cve-2026-91428-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User unauthorized access in Open UI](https://junglewise.ai/threats/cve-2026-91412-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)
- [Oracle Siebel CRM End User cross-site request forgery in Open UI](https://junglewise.ai/threats/cve-2026-91390-vulnerability-in-the-siebel-crm-end-user-product-of-oracle-siebel)