Is CVE-2026-91364 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91364 being exploited in the wild.

How severe is CVE-2026-91364?

Medium severity, with a CVSS score of 6.8, 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-2026-91364?

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-2026-91364 attacked?

It is attacked from the adjacent network.

Am I affected by CVE-2026-91364?

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.

CVE-2026-91364: Oracle Siebel CRM Cloud Applications authentication bypass in Siebel Cloud Manager

CVE-2026-91364 · Severity: medium · CVSS 6.8 · Published 2026-10-20

Oracle Siebel CRM is a customer relationship management platform used by enterprises to manage sales, service, and marketing operations. This vulnerability allows an unauthenticated attacker with physical access to the network segment where Siebel CRM runs to bypass authentication and read, modify, or delete critical customer data without authorization. An attacker could gain complete access to all CRM data stored in the application, leading to data breach or manipulation of business-critical information.

Technologies: Oracle Siebel CRM Cloud Applications. Vendors: Oracle.

Quick answers

Is CVE-2026-91364 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91364 being exploited in the wild.
How severe is CVE-2026-91364?: Medium severity, with a CVSS score of 6.8, 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-2026-91364?: 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-2026-91364 attacked?: It is attacked from the adjacent network.
Am I affected by CVE-2026-91364?: 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

This is a difficult-to-exploit authentication bypass vulnerability in the Siebel Cloud Manager component of Oracle Siebel CRM Cloud Applications. The vulnerability requires the attacker to have adjacent network access (physical connection to the communication segment) and is triggered without user interaction or authentication. A successful exploit allows unauthorized read and write access to critical data across all accessible Siebel CRM instances.

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

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