Quick answers
- Is CVE-2026-91420 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91420 being exploited in the wild.
- How severe is CVE-2026-91420?
- 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 through 26.9.
- Is there a fix for CVE-2026-91420?
- 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-2026-91420 attacked?
- It is in a web application.
- Am I affected by CVE-2026-91420?
- 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
A network-accessible vulnerability in the Server Infrastructure component of Siebel CRM Deployment allows low-privileged authenticated attackers to modify or delete critical data through HTTP requests. The vulnerability requires valid user credentials and network access but no user interaction; successful exploitation results in unauthorized modification or deletion of data accessible within the CRM system. This is an integrity-focused attack with no confidentiality or availability impact.
Affected products
- Oracle Siebel CRM Deployment 17.0 through 26.9
Timeline
- 2026-10-20: disclosed