CVE-2026-91491 Oracle CVE debrief

Who should care

Defenders responsible for Oracle Identity Manager Connector, IT teams managing Oracle Fusion Middleware, and security teams focused on identity and access management should assess exposure and prioritize patching.

Why it matters

CVE-2026-91491 is a critical vulnerability in Oracle Identity Manager Connector that allows unauthenticated attackers to potentially take over the connector via LDAP. Defenders should immediately assess exposure, prioritize patching, and monitor for takeover attempts due to the high severity and potential for significant impact.

• Potential takeover of Oracle Identity Manager Connector
• Unauthenticated access via LDAP
• High CVSS score indicating Critical severity
• Requires immediate patching and monitoring

Technical summary

The vulnerability in Oracle Identity Manager Connector, specifically in the LDAP Gateway component of Oracle Fusion Middleware, allows an unauthenticated attacker with network access via LDAP to compromise the Oracle Identity Manager Connector. Affected versions are 12.2.1.4.0 and 14.1.2.1.0. The CVSS 3.1 Base Score is 9.8, indicating a Critical severity level. Successful attacks could result in a takeover of the connector. Defenders should immediately assess exposure, prioritize patching, and monitor for potential takeover attempts due to the high severity and potential for significant impact.

Defensive priority

Immediately assess exposure of Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0, prioritize patching, and monitor for potential takeover attempts.

Recommended defensive actions

• Assess exposure of Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0
• Prioritize patching for Oracle Identity Manager Connector
• Monitor for potential takeover attempts via LDAP
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, its impacts, and affected versions. Oracle's security alert for October 2026 is also referenced. The vulnerability affects Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0. Defenders should verify exposure and prioritize patching due to the high severity and potential for significant impact. Evidence is limited to public sources and CVE details.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.