Quick answers
- Is CVE-2026-91663 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91663 being exploited in the wild.
- How severe is CVE-2026-91663?
- Critical severity, with a CVSS score of 9.9, published 20 October 2026.
- Which products and versions are affected?
- Oracle Essbase 21.8.3.0.0.
- Is there a fix for CVE-2026-91663?
- 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-2026-91663 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-91663?
- 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 vulnerability in Oracle Essbase's security component allows a low-privileged attacker with network access via T3 or IIOP protocols to achieve complete system compromise. The vulnerability has a changed scope, meaning successful exploitation can significantly impact systems beyond Essbase itself. The attack requires no user interaction and no special configuration.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed