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Oracle Internet Directory EUVDEUVD-2026-79389

| CVE-2026-83061 CRITICAL
Improper Authentication (CWE-287)
2026-09-15 secalert_us@oracle.com GHSA-5hqm-fgh7-8r5j
9.8
CVSS 3.1 · Vendor: oracle
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Reach OID LDAP Server over network
  2. Delivery
    Send crafted LDAP request
  3. Exploit
    Bypass authentication (CWE-287)
  4. Execution
    Compromise directory service
  5. Impact
    Full takeover of Oracle Internet Directory

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

No special conditions - remote unauthenticated exploitation over the network against the OID LDAP Server component of Oracle Internet Directory (versions 12.2.1.4.0 and 14.1.2.1.0). Exploitation requires only network access to the LDAP service (default listener); Oracle describes it as 'easily exploitable' with no authentication (PR:N), no user interaction (UI:N), and no special configuration. The primary limiting factor is network exposure of the OID LDAP port - organizations that restrict LDAP access to trusted management segments materially reduce reachability. No known public exploit code exists at time of analysis.

Impact

This is a genuine high-priority vulnerability. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8) is internally consistent and well-calibrated: the Oracle description explicitly states an unauthenticated attacker with network access via LDAP can 'easily' exploit it (matching AC:L/PR:N) to achieve full takeover of Oracle Internet Directory (matching C:H/I:H/A:H). CWE-287 (Improper Authentication) aligns with the 'Authentication Bypass' tag. The dynamic exploitation signals, however, are all absent: there is no EPSS score, no CISA KEV listing, and no public POC in the provided data, so this is 'no public exploit identified at time of analysis' - not active exploitation. No SSVC decision data was supplied. The result is a high-severity, high-plausibility issue (pre-auth compromise of a core identity/directory service) that is not yet known to be exploited in the wild; the gap between a 9.8 base score and empty threat-intel signals suggests it should be patched promptly but is not (yet) evidence of mass exploitation. As is typical of Oracle CPU entries, the advisory provides zero technical detail, so the exact flaw and affected code path cannot be independently confirmed.

Exploit ScenarioDerived

An attacker with network reachability to the OID LDAP Server port sends a crafted LDAP request that abuses the improper authentication flaw, without supplying any valid credentials. This grants full compromise (read, modify, and denial) of the Oracle Internet Directory, which as an enterprise identity store can cascade into broader authentication and directory abuse. No public exploit code has been identified at time of analysis.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

Unauthenticated attackers with network access to the OID LDAP Server component can fully compromise Oracle Internet Directory versions 12.2.1.4.0 and 14.1.2.1.0, achieving complete loss of confidentiality, integrity, and availability of the directory service (CVSS 3.1 base score 9.8). Because the flaw is an improper authentication weakness (CWE-287) reachable over LDAP with no credentials, no user interaction, and no special configuration - Oracle itself characterizes it as 'easily exploitable' - any directory deployment whose LDAP listener is exposed to an untrusted network is directly at risk of takeover. No public exploit code has been identified at time of analysis, and the vulnerability has not been confirmed as actively exploited (no CISA KEV listing), so the practical risk is driven primarily by network exposure of the OID LDAP port.

RemediationAI

Apply the Oracle Critical Security Patch Update referenced in the vendor advisory (https://www.oracle.com/security-alerts/cspusep2026.html) for Oracle Internet Directory 12.2.1.4.0 and 14.1.2.1.0; patch availability is established through Oracle's security-alert cycle, but the advisory does not publish a discrete fix build number in the data provided, so confirm the exact patched release for your OID branch before scheduling maintenance. Until patching completes, the most effective compensating control is reducing reachability: restrict the OID LDAP/LDAPS listeners (default TCP 389 and 636) at the firewall or network ACL layer so only trusted administration and application subnets can connect - the trade-off is that distributed applications and remote administrative clients sourcing from other segments will break until their paths are explicitly allowlisted. Where LDAP exposure cannot be fully closed, disable the plaintext LDAP listener in favor of LDAPS and require client certificate authentication for binds, accepting the added operational overhead of certificate lifecycle management; also consider disabling anonymous or unauthenticated bind behavior in the directory configuration so improper-authentication attempts fail closed. Because the defect is an authentication-bypass class issue, signature-based detection is weak - prioritize enabling verbose OID bind and access logging and alerting on anomalous bind successes, unexpected privileged operations, or schema/ACL changes originating from untrusted source addresses, and treat any such event during the exposure window as a potential compromise requiring credential rotation for directory principals.

Affected VersionsENISA

Oracle Internet Directory 14.1.2.1.0
Oracle Internet Directory 12.2.1.4.0

Affected Packages

euvd oracle_internet_directory no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Oracle Internet Directory (OID) is the LDAPv3 directory server component of Oracle Fusion Middleware, widely deployed as the identity store behind Oracle Identity Management, Oracle Access Manager, and enterprise application authentication flows. The affected component is the OID LDAP Server, which listens for directory bind and search/modify operations (typically TCP 389 for LDAP and 636 for LDAPS). The root cause class is CWE-287, Improper Authentication - the server fails to correctly verify the identity asserted during an LDAP operation, so a remote, unauthenticated party can reach a state it should never obtain, effectively bypassing the bind/authentication control and gaining the privileges of a trusted directory principal. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) confirms a network-reachable, low-complexity, unauthenticated path with high impact across all three security properties, consistent with an attacker reading, modifying, or destroying directory content - including identity and credential data - and thereby taking over the OID instance. Oracle has not published the specific faulty code path, and ENISA's EUVD record (EUVD-2026-79389) mirrors the same two affected builds.

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Severity by source

Vendor (oracle) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 9.8 CRITICAL

Description confirms easily exploitable, unauthenticated network LDAP attack (AV:N/AC:L/PR:N/UI:N) yielding full takeover of the directory itself (C:H/I:H/A:H, S:U as no cross-component scope change stated).

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (oracle).

CVSS VectorVendor: oracle

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

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 LDAP 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 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Executive ViewAI

Why It Matters

Oracle Internet Directory versions 12.2.1.4.0 and 14.1.2.1.0 contain a maximum-severity flaw in the OID LDAP Server component that can give an attacker complete control of the enterprise directory - the authoritative source of user identities, credentials, and access entitlements for connected applications and services. With no vendor patch available, the entire risk posture for these deployments rests on whether the LDAP listener is reachable from untrusted networks, and any exposure effectively places the organization's identity backbone in scope for full compromise. Leadership should plan for this as a potential enterprise-wide identity and access disruption rather than a contained single-system outage.

Business Impact: Severe
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: restrict the OID LDAP listener to trusted administrative network segments and block all untrusted inbound reachability at the perimeter and host firewall; avoid any internet-facing or partner-facing directory listener; deploy network and host-based monitoring/IDS focused on anomalous LDAP bind, query, and write activity; enforce least-privilege directory administration accounts and rotate directory service and administrative credentials; take and preserve offline backups to support recovery if the directory is compromised; and track Oracle's advisory channel to apply a fixed version immediately upon release.

Threat Intelligence Overview

EPSS Score
0.5%
Top 60% exploitable
Prevalence
Medium
enterprise LDAP/IAM directory, common in Oracle Fusion Middleware shops but not ubiquitous
Data Quality
4 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.5%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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