Quick answers
- Is CVE-2026-91651 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91651 being exploited in the wild.
- How severe is CVE-2026-91651?
- High severity, with a CVSS score of 8.5, published 20 October 2026.
- Which products and versions are affected?
- Oracle Essbase 21.8.3.0.0.
- Is there a fix for CVE-2026-91651?
- 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-2026-91651 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-91651?
- 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
A privilege escalation flaw in the Essbase Web Platform allows a low-privileged attacker with network access via HTTP to escalate to administrative control (scope change). The vulnerability is difficult to exploit and requires authenticated access, but successful exploitation results in full system compromise with impacts to confidentiality, integrity, and availability. A fix status is not specified in the advisory.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed