CVE-2026-91641 Oracle CVE debrief

Who should care

Defenders responsible for Oracle Essbase deployments, particularly those with low-privileged users and network access via HTTP, should assess exposure and prioritize verifying the version in use.

Why it matters

Defenders should care about CVE-2026-91641 because it allows low-privileged attackers with network access via HTTP to compromise Oracle Essbase, potentially impacting additional products and leading to unauthorized read access to Oracle Essbase data. Priority should be given to verifying exposure of Oracle Essbase version 21.8.3.0.0, assessing the impact of potential unauthorized read access, and monitoring Oracle Essbase data.

• Potential unauthorized read access to Oracle Essbase data
• Possible impact on additional products due to scope change
• Need to verify Oracle Essbase version 21.8.3.0.0 exposure
• Priority on monitoring Oracle Essbase data for suspicious access

Technical summary

The vulnerability in Oracle Essbase (component: Security) is easily exploitable and allows low-privileged attackers with network access via HTTP to compromise Oracle Essbase. Successful attacks can result in unauthorized read access to a subset of Oracle Essbase accessible data. The CVSS 3.1 Base Score is 5.0 (Confidentiality impacts). The vulnerability affects Oracle Essbase version 21.8.3.0.0 and has a CVSS vector of (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N). Defenders should prioritize verifying exposure of Oracle Essbase version 21.8.3.0.0 and assessing the impact of potential unauthorized read access to Oracle Essbase data.

Defensive priority

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

Recommended defensive actions

• Verify Oracle Essbase version 21.8.3.0.0 is in use and assess exposure
• Review network access controls to limit low-privileged attacker access via HTTP
• Monitor Oracle Essbase data for unauthorized read access
• Perform a thorough review of Oracle Essbase configurations and deployments
• Assess the impact of potential unauthorized read access to Oracle Essbase data
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 5.0 and vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N). The vulnerability affects Oracle Essbase version 21.8.3.0.0 and allows low-privileged attackers with network access via HTTP to compromise Oracle Essbase. The NVD entry and CVE record provide source-grounded information on the vulnerability, but additional verification is needed to confirm affected deployments and assess potential impact.

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.