CVE-2026-91490 Oracle CVE debrief

Who should care

Defenders responsible for Oracle Identity Manager Connector deployments, specifically those using versions 12.2.1.4.0 and 14.1.2.1.0, should assess their exposure and take immediate action to mitigate this vulnerability.

Why it matters

CVE-2026-91490 is a critical vulnerability in Oracle Identity Manager Connector that allows unauthenticated attackers to potentially access and modify sensitive data. Defenders should verify exposure, restrict network access, and prioritize patching to mitigate this vulnerability.

• Potential unauthorized creation, deletion, or modification of critical data within Oracle Identity Manager Connector.
• Potential unauthorized access to critical data or complete access to all Oracle Identity Manager Connector accessible data.
• Requires verification of exposure for Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0.
• Prioritization of patching or mitigation efforts based on business criticality and exposure.

Technical summary

The vulnerability in Oracle Identity Manager Connector (CVE-2026-91490) is caused by a weakness in the LDAP Gateway component. It allows an unauthenticated attacker with network access via LDAP to compromise the Oracle Identity Manager Connector, potentially leading to unauthorized data access and modification. The vulnerability has a CVSS 3.1 Base Score of 9.1, indicating Critical severity. Affected product deployments should be verified, and defenders should prioritize patching or applying mitigations. The CVE record, NVD detail page, and Oracle's security alert provide further information on the vulnerability and its impacts.

Defensive priority

Defenders should prioritize verifying exposure of Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0, assessing network access controls, and applying vendor patches or mitigations as available.

Recommended defensive actions

• Verify exposure of Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0 in your environment.
• Assess and restrict network access to LDAP services for Oracle Identity Manager Connector.
• Apply patches or mitigations provided by Oracle as soon as possible.
• Monitor for suspicious activity related to Oracle Identity Manager Connector.
• 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.

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 also addresses this vulnerability. Defenders should verify exposure of Oracle Identity Manager Connector versions 12.2.1.4.0 and 14.1.2.1.0, assess network access controls, and apply vendor patches or mitigations as available. Evidence is limited to public sources and may not reflect all potential impacts or affected systems.

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.