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CVE-2026-91637: Vulnerability in Oracle Essbase (component: Security)

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CRITICAL 9.9DOWNGRADE

CVE-2026-91637 is a critical-severity flaw (CVSS 9.9) 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 takeover of Oracle Essbase. CVSS 3.1 Base Sc

Why this priority

  • Critical severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score9.9 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.3% (top 80%)
CISA exploited listNo
WeaknessCWE-284
Published2026-10-20
Last modified2026-10-23
Publisher (CNA): Oracle · Vendor: oracle

Am I affected?

Timeline

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.
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.

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References

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