CVE-2026-83411 Overview
CVE-2026-83411 is a privilege management vulnerability in the Core component of Oracle Coherence, part of Oracle Fusion Middleware. The flaw allows a low-privileged attacker with network access via HTTP to compromise Oracle Coherence. Successful exploitation results in full takeover of the affected Oracle Coherence instance, impacting confidentiality, integrity, and availability. Oracle documented the issue in the Oracle Security Alert CSPUSEP2026. The weakness is categorized under [CWE-269] Improper Privilege Management.
Critical Impact
An authenticated attacker with minimal privileges can take over Oracle Coherence clusters over the network, exposing sensitive in-memory data and enabling arbitrary control of cached application state.
Affected Products
- Oracle Coherence 14.1.1.0.0
- Oracle Coherence 14.1.2.0.0
- Oracle Coherence 15.1.1.0.0
Discovery Timeline
- 2026-09-15 - CVE-2026-83411 published to NVD
- 2026-09-17 - Last updated in NVD database
Technical Details for CVE-2026-83411
Vulnerability Analysis
Oracle Coherence is a distributed in-memory data grid used to cache and manage application state across Oracle Fusion Middleware deployments. The Core component handles cluster membership, request routing, and administrative operations. This vulnerability lets a low-privileged authenticated user issue HTTP requests that Coherence processes with elevated privileges. The attacker does not need user interaction, and the attack complexity is low.
Successful exploitation grants full control of the Coherence instance. That level of access exposes cached data, allows tampering with grid entries, and can disrupt dependent applications. Because Coherence clusters often store sensitive session, transactional, or identity data, takeover carries downstream risk for any application that trusts the grid. The Oracle advisory lists all three supported branches (14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0) as affected.
Root Cause
The issue is classified as [CWE-269] Improper Privilege Management. A network-reachable code path in the Core component fails to enforce the privilege boundary between an authenticated low-privileged principal and administrative operations. As a result, actions that should require higher authorization are executed under the caller's request context without adequate checks.
Attack Vector
Exploitation requires network access to the Coherence HTTP interface and a valid low-privileged account. The attacker sends crafted HTTP requests to reachable Coherence endpoints. No user interaction is required, and the scope of the compromise remains within the vulnerable component but yields high confidentiality, integrity, and availability impact.
No public proof-of-concept has been published at the time of writing. Refer to the Oracle Security Alert CSPUSEP2026 for vendor-supplied technical details.
Detection Methods for CVE-2026-83411
Indicators of Compromise
- Unexpected administrative or management operations on Coherence nodes originating from low-privileged service accounts.
- HTTP requests to Coherence management endpoints from clients that do not normally interact with the cluster.
- Anomalous cache modifications, entry deletions, or configuration changes not tied to deployment activity.
- New or unexpected JMX, REST, or extend-client sessions terminating on Coherence nodes.
Detection Strategies
- Correlate HTTP access logs on Coherence nodes with the identity of the requesting principal to flag privilege mismatches.
- Alert on Coherence audit events where operation type exceeds the caller's assigned role.
- Baseline normal cluster administrative traffic and detect deviations in request volume, source, or endpoint.
Monitoring Recommendations
- Forward Coherence, WebLogic, and application server logs to a centralized analytics platform for correlation.
- Monitor egress from Coherence hosts for unusual outbound connections that may indicate post-exploitation activity.
- Track process execution and file changes on Coherence hosts to detect follow-on tooling deployed after takeover.
How to Mitigate CVE-2026-83411
Immediate Actions Required
- Apply the patches referenced in the Oracle Security Alert CSPUSEP2026 to all Coherence 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0 deployments.
- Inventory all Coherence instances, including those embedded in WebLogic and custom Fusion Middleware applications.
- Rotate credentials for any accounts with network access to Coherence management interfaces.
- Review Coherence role assignments and remove unnecessary low-privileged accounts with network reachability.
Patch Information
Oracle released fixes as part of the CSPUSEP2026 security alert. Administrators should download the corresponding patch for each affected version (14.1.1.0.0, 14.1.2.0.0, 15.1.1.0.0) from My Oracle Support and apply it in accordance with Oracle's standard Fusion Middleware patching procedures. Validate cluster health and application behavior in a staging environment before production rollout.
Workarounds
- Restrict network access to Coherence HTTP and management ports to trusted management subnets using firewall or security-group rules.
- Enforce strong authentication and least-privilege role assignments on all Coherence-facing accounts.
- Disable unused Coherence management endpoints and REST interfaces where operationally feasible until patching is complete.
# Example: restrict Coherence management port access with iptables
# Replace <mgmt_subnet> and <coherence_mgmt_port> with your values
iptables -A INPUT -p tcp -s <mgmt_subnet> --dport <coherence_mgmt_port> -j ACCEPT
iptables -A INPUT -p tcp --dport <coherence_mgmt_port> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
