Quick answers
- Is CVE-2026-91661 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91661 being exploited in the wild.
- How severe is CVE-2026-91661?
- High severity, with a CVSS score of 7.7, published 20 October 2026.
- Which products and versions are affected?
- Oracle Essbase 21.8.3.0.0.
- Is there a fix for CVE-2026-91661?
- 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-2026-91661 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-91661?
- Check whether you run Oracle Essbase 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 easily exploitable authentication bypass or privilege escalation exists in Oracle Essbase 21.8.3.0.0 within its security component. A low-privileged attacker can exploit this via HTTP network access without user interaction to gain unauthorized access to critical data. The vulnerability has a scope change, indicating that successful exploitation may impact systems beyond Essbase itself that depend on its data.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed