# CVE-2026-91429: Oracle Siebel CRM Server Infrastructure authentication bypass

Source: https://junglewise.ai/threats/cve-2026-91429-vulnerability-in-the-siebel-crm-deployment-product-of-oracle  
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-2026-91429 · Severity: medium · CVSS 6.5 · Published 2026-10-20

Oracle Siebel CRM is a customer relationship management platform that businesses use to manage sales, service, and customer data. An unauthenticated attacker with network access can bypass authentication protections and gain unauthorized access to sensitive customer data or modify critical information. The vulnerability requires specific technical conditions to exploit but could expose confidential business information or enable unauthorized changes to customer records.

Technologies: [Oracle Siebel CRM Deployment](https://junglewise.ai/threats/technologies/siebel-crm-deployment). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91429 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91429 being exploited in the wild.

**How severe is CVE-2026-91429?** Medium severity, with a CVSS score of 6.5, published 20 October 2026.

**Which products and versions are affected?** Oracle Siebel CRM Deployment 17.0 to 26.9.

**Is there a fix for CVE-2026-91429?** 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-2026-91429 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-91429?** Check whether you run Oracle Siebel CRM Deployment 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 authentication bypass vulnerability exists in the Siebel CRM Deployment Server Infrastructure component that allows unauthenticated attackers to access the system via HTTP. The vulnerability has high complexity requirements (AC:H) but no authentication or user interaction prerequisites. Successful exploitation results in unauthorized read access to critical data and limited write capabilities (update, insert, delete on some data).

## Affected products

- Oracle Siebel CRM Deployment 17.0 to 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 unauthorized data access in Server Infrastructure](https://junglewise.ai/threats/cve-2026-91450-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)
- [Oracle Siebel CRM Deployment unauthorized data access via HTTP](https://junglewise.ai/threats/cve-2026-91449-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)
- [Oracle Siebel CRM Deployment unauthenticated data access](https://junglewise.ai/threats/cve-2026-91448-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)
- [Oracle Siebel CRM Deployment unauthorized data access](https://junglewise.ai/threats/cve-2026-91447-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)
- [Oracle Siebel CRM privilege escalation in Server Infrastructure](https://junglewise.ai/threats/cve-2026-91444-vulnerability-in-the-siebel-crm-deployment-product-of-oracle)