External risk intelligence

Oracle Identity Manager Connector LDAP Gateway Takeover Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-91491

The vulnerability affects an LDAP Gateway component within Oracle Identity Manager Connector. While it is network-accessible, LDAP gateways in this context are typically deployed within internal corporate networks to facilitate identity synchronization rather than being exposed directly to the public internet. Public internet exposure for this specific component is uncommon in standard deployment patterns.

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in Oracle Identity Manager Connector, a component of Oracle Fusion Middleware. This issue, if exploited, could allow an unauthenticated attacker to gain complete control of the affected system by compromising the LDAP Gateway. The potential for significant data impact and system compromise necessitates understanding its relevance to our environment.

Unauthenticated attackers can take over the system.
This could impact critical identity management functions.
Confirm if Oracle Identity Manager Connector is in use.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker with network access could target the Oracle Identity Manager Connector's LDAP Gateway. Successful exploitation could allow an attacker to gain complete control over the Oracle Identity Manager Connector.

Network access via LDAP required.
Attacker compromises the Oracle Identity Manager Connector.
Complete takeover of the connector is possible.

Live Threat

Current exploitation, exposure, and threat context

An unauthenticated attacker with network access could compromise the Oracle Identity Manager Connector when this vulnerability is exploited. This could lead to the takeover of the Oracle Identity Manager Connector, impacting its confidentiality, integrity, and availability.

Oracle Identity Manager Connector system.
Network access via LDAP.
Takeover of the Oracle Identity Manager Connector.

Operational Fix

Recommended remediation, mitigation, and detection steps

Because this vulnerability affects the Oracle Identity Manager Connector, the platform or infrastructure teams responsible for managing Oracle Fusion Middleware are likely the first point of contact. The initial practical step is to locate all instances of the affected technology, assess their network reachability and business criticality, identify the accountable system owner, and then develop a remediation plan based on the identified risks.

Platform/Infrastructure teams own the issue.
Verify network reachability and business criticality.
Plan remediation based on risk assessment.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Oracle Identity Manager Connector?

It is a specialized software component within Oracle Fusion Middleware. Organizations use it to synchronize identity data between their central Oracle Identity Manager platform and external systems, such as LDAP directories, ensuring user accounts and access rights remain consistent across the enterprise.

How does CVE-2026-91491 affect the LDAP Gateway?

This vulnerability indicates a significant security weakness in the LDAP Gateway component. Because this gateway acts as a bridge for identity traffic, a flaw here allows unauthorized parties to bypass security controls, potentially gaining full control over the connector software and the data it handles.

Do I need specific access to trigger this vulnerability?

Yes, an attacker must have network access to the LDAP Gateway to attempt an exploit. However, this does not require a user account or any prior authentication. The flaw cannot be triggered if the system is not reachable via the network or if the LDAP Gateway is not active.

Is my environment at risk from CVE-2026-91491?

Halo Surface Signal notes that while this component is network-accessible, it is typically deployed within internal corporate networks to manage identity synchronization. Because these gateways are rarely exposed directly to the public internet, the likelihood of remote exploitation from outside your organization is generally considered low.

How should I respond to this threat advisory?

Start by identifying all instances of the Oracle Identity Manager Connector in your environment. Once located, verify if you are running version 12.2.1.4.0 or 14.1.2.1.0. Assess the network placement of these instances and coordinate with your infrastructure team to prioritize them for vendor-supplied updates.

References

www.oracle.com/security-alerts/cpuoct2026.html

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.