CVE-2026-83066: Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-83066 is a critical-severity flaw (CVSS 9.8) affecting internet directory. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle Internet Directory. Successful attacks of this vulnerability can result in takeover of Oracle Internet Directory. CVSS 3.1 Base Score 9.8 (Confiden

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-287, CWE-306
Published	2026-09-15
Last modified	2026-09-22

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-09-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-15 20:18 UTCPublished CVE record published
2026-09-22 19:07 UTCUpdated Record last modified

oracle internet directory DOWNGRADE

Affected: 12.2.1.4.0 · 14.1.2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.2.1.4.0

1. Check installed version

apt-cache policy internet-directory || rpm -q internet-directory || internet-directory --version

2. No fixed release: DOWNGRADE to a release before 12.2.1.4.0 (Debian / Ubuntu)

apt-cache madison internet-directory sudo apt install internet-directory=<VERSION_BEFORE_12.2.1.4.0> sudo apt-mark hold internet-directory

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

dnf --showduplicates list internet-directory sudo dnf downgrade internet-directory-<VERSION_BEFORE_12.2.1.4.0> sudo dnf versionlock add internet-directory

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-2026-83066?

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

Is CVE-2026-83066 being exploited?

CVE-2026-83066 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-2026-83066 affect?

CVE-2026-83066 affects internet directory. Severity is critical (CVSS 9.8). Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server). Supported versions that are affected are 12.2.1.4.0 and 14.1.2.1.0. Easily exploitable vulnerability allows unauthenticated a

How urgent is CVE-2026-83066?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-61241 CRITICAL 10.0 DOWNGRADE Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server
CVE-2026-61258 CRITICAL 9.8 DOWNGRADE Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server
CVE-2026-61248 CRITICAL 9.9 DOWNGRADE Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server
CVE-2026-83054 CRITICAL 9.8 DOWNGRADE Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server
CVE-2026-83059 CRITICAL 10.0 DOWNGRADE Vulnerability in the Oracle Internet Directory product of Oracle Fusion Middleware (component: OID LDAP Server

References

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