Unauthenticated remote takeover of Oracle Internet Directory in widely used Oracle Fusion Middleware; impacts enterprise identity/infrastructure and could disrupt many organizations.
CVE-2026-83066
Unauthenticated remote takeover of Oracle Internet Directory via T3/IIOP.
Is CVE-2026-83066 being exploited?
Not confirmed. CVE-2026-83066 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-83066?
CVE-2026-83066 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-83066?
Not known from our data. No patch reference has been recorded for CVE-2026-83066, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-83066 affect?
CVE-2026-83066 affects Oracle Internet Directory 12.2.1.4.0, Oracle Internet Directory 14.1.2.1.0, Oracle Fusion Middleware (OID component), T3/IIOP listeners. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-83066?
Apply vendor updates ASAP; if not available, block T3/IIOP, restrict/segment OID, and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote compromise of Oracle Internet Directory allowing full takeover, data theft, or service disruption via T3/IIOP.
Immediate action required
- affected12.2.1.4.0
- affected14.1.2.1.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.