CVE-2026-91639 Oracle CVE debrief

Who should care

Defenders responsible for Oracle Essbase deployments, security teams assessing potential data access risks, and IT staff managing system updates and patches should be aware of this vulnerability and its potential impact.

Why it matters

Defenders should prioritize verifying exposure of Oracle Essbase 21.8.3.0.0 and assessing the impact of potential unauthorized data access due to the easily exploitable vulnerability allowing low-privileged attackers to compromise Oracle Essbase.

• Potential unauthorized access to critical data or complete access to all Oracle Essbase accessible data.
• Need to verify exposure of Oracle Essbase 21.8.3.0.0 in the environment.
• Potential impact on additional products due to scope change.

Technical summary

The vulnerability in Oracle Essbase (component: Security) is easily exploitable and allows a low-privileged attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks can result in unauthorized access to critical data or complete access to all Oracle Essbase accessible data. The CVSS 3.1 Base Score is 7.7 (Confidentiality impacts). The vulnerability has a CVSS Vector of (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). The supported version that is affected is 21.8.3.0.0. Attacks may significantly impact additional products (scope change).

Defensive priority

Defenders should prioritize verifying exposure of Oracle Essbase 21.8.3.0.0 and assessing the impact of potential unauthorized data access.

Recommended defensive actions

• Verify the exposure of Oracle Essbase 21.8.3.0.0 in your environment.
• Assess the potential impact of unauthorized data access on your systems.
• Review and apply vendor-provided security patches or updates for Oracle Essbase.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its impact, and affected versions. However, additional information on potential exploitation or remediation may be needed. The vulnerability is in Oracle Essbase (component: Security), with a CVSS Vector of (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.