Quick answers
- Is CVE-2026-91389 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91389 being exploited in the wild.
- How severe is CVE-2026-91389?
- Medium severity, with a CVSS score of 5.4, 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-2026-91389?
- 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-2026-91389 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-91389?
- 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
A privilege escalation vulnerability exists in the Open UI component of Siebel CRM End User, where insufficient access controls allow low-privileged attackers with network access to perform unauthorized data operations through HTTP requests. Exploitation requires user interaction (likely a clickjacking or CSRF scenario) but results in unauthorized read, update, insert, or delete access to CRM data with potential scope change to downstream systems. No indication of a publicly available exploit or patch status.
Affected products
- Oracle Siebel CRM End User 17.0-26.9
Timeline
- 2026-10-20: disclosed