Quick answers
- Is CVE-2026-91646 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91646 being exploited in the wild.
- How severe is CVE-2026-91646?
- Medium severity, with a CVSS score of 5.6, published 20 October 2026.
- Which products and versions are affected?
- Oracle Essbase 21.8.3.0.0.
- Is there a fix for CVE-2026-91646?
- 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-2026-91646 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-91646?
- 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 authentication bypass vulnerability in Oracle Essbase allows unauthenticated attackers with network access via T3 and IIOP protocols to compromise the system. The vulnerability is difficult to exploit and requires no user interaction, resulting in unauthorized data access, modification, and partial denial of service against the application.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed