Quick answers
- Is CVE-2026-91366 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91366 being exploited in the wild.
- How severe is CVE-2026-91366?
- Medium severity, with a CVSS score of 4.7, published 20 October 2026.
- Which products and versions are affected?
- Oracle Siebel CRM Cloud Applications 22.3-26.9.
- Is there a fix for CVE-2026-91366?
- 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-2026-91366 attacked?
- It is attacked from the adjacent network, in a hosted service.
- Am I affected by CVE-2026-91366?
- 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
An adjacent-network privilege escalation vulnerability exists in the Siebel Cloud Manager component of Siebel CRM Cloud Applications. The vulnerability requires difficult exploitation conditions: an unauthenticated attacker must have physical access to the communication segment attached to the hardware executing the application. Successful exploitation results in unauthorized read access to a subset of data and unauthorized update, insert, or delete access to some data, with scope change indicating potential impact to other products.
Affected products
- Oracle Siebel CRM Cloud Applications 22.3-26.9
Timeline
- 2026-10-20: disclosed