How severe is CVE-2026-91642?

CVE-2026-91642 has a CVSS score of 7.3/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2026-91642?

CVE-2026-91642 affects the following products: oracle essbase.

How do I patch CVE-2026-91642?

No patch has shipped for CVE-2026-91642 yet — track the oracle essbase advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2026-91642 across my infrastructure?

Inventory every oracle essbase deployment and check each version against the affected-products list above.

How do I mitigate CVE-2026-91642 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2026-91642 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-91642 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-91642?

CVE-2026-91642 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 14th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Which products and versions are affected by CVE-2026-91642?

CVE-2026-91642 affects oracle essbase (1 version, e.g. 21.8.3.0.0). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2026-91642 published, and has it been updated?

CVE-2026-91642 was published on October 20, 2026 and was last updated on October 23, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

Not in CISA KEV

HIGH severity

CVE-2026-91642 — Essbase

HIGH

CVE-2026-91642 is a high-severity (CVSS 7.3) vulnerability in oracle essbase. No vendor fix is recorded yet; mitigation options are listed below.

Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated attacker with…

Published

Oct 20, 2026

Updated

Oct 23, 2026

Affected

1 product

Patched

See advisory

Exploits

None indexed

Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs14th percentile — riskier than 14% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-91642 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,415 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Essbase accessible data as well as unauthorized read access to a subset of Oracle Essbase accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Essbase. CVSS 3.1 Base Score 7.3 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Affected Products

1 product · 1 configurations

Application

essbaseoracle

1 version

21.8.3.0.0

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every oracle essbase deployment and check each version against the affected-products list above.
Remediation status
No patch has shipped for CVE-2026-91642 yet — track the oracle essbase advisory for a fixed release and apply the workarounds below in the meantime.
Mitigate without a patch
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

O3 Security · Runtime Protection

Is CVE-2026-91642 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works