Quick answers
- Is CVE-2026-91637 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91637 being exploited in the wild.
- How severe is CVE-2026-91637?
- 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-2026-91637?
- 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-2026-91637 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-91637?
- 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
The vulnerability exists in the Security component of Oracle Essbase and is easily exploitable by a low-privileged attacker with network access via HTTP. The flaw allows complete system takeover with high impact on confidentiality, integrity, and availability, and affects the scope of other products. No authentication bypass is required beyond low-level privileges, making it a significant risk in network-exposed deployments.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed