CVE-2026-91662: Vulnerability in Oracle Essbase (component: Java Based Agent)

Routine

MEDIUM 6.4DOWNGRADE

CVE-2026-91662 is a medium-severity flaw (CVSS 6.4) 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: Java Based Agent). The supported version that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Essbase executes 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

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Published	2026-10-20
Last modified	2026-10-23

Publisher (CNA): Oracle · Vendor: oracle

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.

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-2026-91662?

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

Is CVE-2026-91662 being exploited?

CVE-2026-91662 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-2026-91662 affect?

CVE-2026-91662 affects essbase. Severity is medium (CVSS 6.4). Vulnerability in Oracle Essbase (component: Java Based Agent). The supported version that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Essbase e

How urgent is CVE-2026-91662?

Priority 23/100. No elevated risk signals yet.

Software pages

Java vulnerabilities

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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