Quick answers
- Is CVE-2026-91644 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91644 being exploited in the wild.
- How severe is CVE-2026-91644?
- Critical severity, with a CVSS score of 9.3, published 20 October 2026.
- Which products and versions are affected?
- Oracle Essbase 21.8.3.0.0.
- Is there a fix for CVE-2026-91644?
- 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-2026-91644 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-91644?
- 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 unauthenticated attackers with network access via HTTP to compromise the system. The vulnerability has a scope change, meaning successful exploitation can impact products beyond Essbase itself. Successful attacks result in unauthorized read access to critical data and limited unauthorized write access to some accessible data.
Affected products
- Oracle Essbase 21.8.3.0.0
Timeline
- 2026-10-20: disclosed