CVE-2026-83340 Overview
CVE-2026-83340 is a privilege escalation vulnerability in Oracle Identity Manager, a component of Oracle Fusion Middleware. The flaw resides in the Security component and affects supported versions 12.2.1.4.0 and 14.1.2.1.0. A low-privileged attacker with network access via HTTP can exploit the weakness to compromise Oracle Identity Manager. Successful exploitation results in full takeover of the affected instance, impacting confidentiality, integrity, and availability. The vulnerability is categorized under CWE-269: Improper Privilege Management.
Critical Impact
Authenticated low-privileged attackers can take over Oracle Identity Manager instances over the network without user interaction.
Affected Products
- Oracle Identity Manager 12.2.1.4.0
- Oracle Identity Manager 14.1.2.1.0
- Oracle Fusion Middleware (Security component)
Discovery Timeline
- 2026-09-15 - CVE-2026-83340 published to NVD
- 2026-09-17 - Last updated in NVD database
- September 2026 - Addressed in Oracle Security Alert September 2026
Technical Details for CVE-2026-83340
Vulnerability Analysis
Oracle Identity Manager (OIM) governs user provisioning, role management, and access certification across enterprise applications. The vulnerability allows a user holding only low privileges to escalate authority and gain administrative control of the OIM instance. Because OIM brokers identity operations for downstream systems, a takeover propagates trust beyond the middleware tier. An attacker who compromises OIM can create accounts, modify entitlements, and access sensitive identity data across connected applications.
Exploitation requires network reachability to the OIM HTTP interface and a valid low-privileged account. The attack complexity is low and no user interaction is required, which broadens the pool of viable attackers to include insiders, contractors, and adversaries who have obtained any foothold credential through phishing or credential stuffing.
Root Cause
The root cause is improper privilege management ([CWE-269]) within the Security component of Oracle Identity Manager. Authorization checks fail to sufficiently restrict actions available to low-privileged authenticated users, permitting operations that should be reserved for administrative principals. Oracle has not published component-level technical details beyond the September 2026 Security Alert.
Attack Vector
The attack vector is network-based over HTTP. An authenticated attacker sends crafted requests to Oracle Identity Manager endpoints that fail to enforce proper privilege boundaries. The unchanged scope indicates the exploitation stays within OIM's authorization boundary, though the resulting takeover provides administrative access to identity governance functions that reach into connected systems.
Refer to the Oracle Security Alert September 2026 for vendor-provided technical context. No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-83340
Indicators of Compromise
- Unexpected role or entitlement changes originating from non-administrative OIM accounts.
- New administrative users or reset credentials created outside of change-control windows.
- HTTP requests to Oracle Identity Manager privileged endpoints from accounts that historically only performed self-service operations.
Detection Strategies
- Audit OIM access policies and role assignments for privilege changes that lack an approved request ticket.
- Correlate authentication logs with privileged action logs to identify low-privilege accounts issuing administrative operations.
- Enable and forward Oracle Fusion Middleware audit logs to a centralized analytics platform for anomaly detection.
Monitoring Recommendations
- Alert on any modification to OIM administrator roles, system configuration, or connector credentials.
- Track HTTP request patterns targeting OIM management URIs from user contexts with limited entitlements.
- Monitor downstream provisioned systems for unusual account creation activity sourced from OIM service accounts.
How to Mitigate CVE-2026-83340
Immediate Actions Required
- Apply the fixes documented in the Oracle Security Alert September 2026 to Oracle Identity Manager 12.2.1.4.0 and 14.1.2.1.0.
- Restrict network access to the OIM HTTP interface using firewall rules and reverse-proxy allow lists.
- Review and rotate credentials for low-privileged OIM accounts, particularly service and integration accounts.
Patch Information
Oracle addressed CVE-2026-83340 in the September 2026 Security Alert cycle. Administrators should consult the Oracle Security Alert September 2026 advisory for patch bundles corresponding to their deployed OIM version and apply them following Oracle's recommended maintenance procedures.
Workarounds
- Enforce network segmentation so that only trusted administrative networks can reach OIM management endpoints.
- Require multi-factor authentication for all OIM accounts to reduce the risk of low-privileged credential compromise.
- Temporarily disable or restrict non-essential OIM self-service endpoints until patches are applied.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
