CVE-2026-91661: Vulnerability in Oracle Essbase (component: Security)

Routine

HIGH 7.7DOWNGRADE

CVE-2026-91661 is a high-severity flaw (CVSS 7.7) affecting essbase. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in Oracle Essbase (component: Security). 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. While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized access to critical data or com

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Published	2026-10-20
Last modified	2026-10-23

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-20 22:21 UTCPublished CVE record published
2026-10-23 17:18 UTCUpdated Record last modified

oracle essbase DOWNGRADE

Affected: 21.8.3.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 21.8.3.0.0

1. Check installed version

apt-cache policy essbase || rpm -q essbase || essbase --version

2. No fixed release: DOWNGRADE to a release before 21.8.3.0.0 (Debian / Ubuntu)

apt-cache madison essbase sudo apt install essbase=<VERSION_BEFORE_21.8.3.0.0> sudo apt-mark hold essbase

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list essbase sudo dnf downgrade essbase-<VERSION_BEFORE_21.8.3.0.0> sudo dnf versionlock add essbase

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · wasmedge · FIXED · 0.18.1-1.fc46 · FEDORA-2026-4c27216e39 · source

sudo dnf upgrade --advisory=FEDORA-2026-4c27216e39

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-91661?

essbase: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-91661 being exploited?

CVE-2026-91661 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-91661 affect?

CVE-2026-91661 affects essbase. Severity is high (CVSS 7.7). Vulnerability in Oracle Essbase (component: Security). 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. While

How urgent is CVE-2026-91661?

Priority 33/100. High severity

Related CVEs

CVE-2026-91630 MEDIUM 6.8 DOWNGRADE Vulnerability in Oracle Essbase (component: Security)
CVE-2026-91631 MEDIUM 5.0 DOWNGRADE Vulnerability in Oracle Essbase (component: Security)
CVE-2026-91633 MEDIUM 6.0 DOWNGRADE Vulnerability in Oracle Essbase (component: Security)
CVE-2026-91634 MEDIUM 5.3 DOWNGRADE Vulnerability in Oracle Essbase (component: Security)
CVE-2026-91635 HIGH 8.1 DOWNGRADE Vulnerability in Oracle Essbase (component: Security)

References

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