CVE-2026-83410: Oracle Coherence Privilege Escalation Flaw

CVE-2026-83410 Overview

CVE-2026-83410 is a privilege management vulnerability in the Core component of Oracle Coherence, part of Oracle Fusion Middleware. The flaw affects supported versions 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. An authenticated attacker with low privileges and network access can exploit this issue over multiple protocols to fully compromise Oracle Coherence. The vulnerability maps to [CWE-269] (Improper Privilege Management) and impacts confidentiality, integrity, and availability. Oracle addressed the issue in the September 2026 Critical Patch Update.

Critical Impact
Successful exploitation results in complete takeover of the Oracle Coherence data grid, exposing cached data and enabling attacker-controlled code paths within the middleware tier.

Affected Products

Oracle Coherence 12.2.1.4.0
Oracle Coherence 14.1.1.0.0 and 14.1.2.0.0
Oracle Coherence 15.1.1.0.0

Discovery Timeline

2026-09-15 - CVE-2026-83410 published to NVD
2026-09-17 - Last updated in NVD database
September 2026 - Oracle releases fix in the Oracle Security Alert September 2026

Technical Details for CVE-2026-83410

Vulnerability Analysis

Oracle Coherence is a distributed in-memory data grid used across Fusion Middleware deployments for caching, session storage, and computation. This vulnerability allows a low-privileged authenticated user to escalate privileges and take over the Coherence instance. Because the attack traverses the network and requires no user interaction, any account with reachable access to Coherence protocols becomes a viable foothold. Once compromised, an attacker can read or manipulate cached data, alter cluster state, and pivot into dependent Fusion Middleware services. The EPSS score at publication was approximately 0.35%, but exposure in production middleware clusters warrants priority remediation.

Root Cause

The root cause is improper privilege management [CWE-269] within the Core component of Coherence. Authorization decisions do not sufficiently constrain what a low-privileged principal can invoke, permitting escalation to administrative operations on the Coherence node.

Attack Vector

The attack path is network-based across multiple Coherence protocols. An attacker authenticates with a low-privileged account, then issues crafted requests that trigger privileged operations. No user interaction is needed, and the scope remains unchanged, with high impact to confidentiality, integrity, and availability of the Coherence process.

No public proof-of-concept code is available. See the Oracle Security Alert September 2026 for advisory details.

Detection Methods for CVE-2026-83410

Indicators of Compromise

Unexpected administrative operations issued from low-privileged Coherence service accounts.
Anomalous cluster membership changes or new nodes joining the Coherence cluster from unfamiliar hosts.
Unusual invocation of management MBeans or Coherence Extend proxy calls outside normal application patterns.

Detection Strategies

Baseline normal Coherence protocol traffic and alert on deviations, particularly management or cluster control messages from application-tier accounts.
Correlate Fusion Middleware authentication logs with Coherence audit events to identify low-privileged users invoking privileged actions.
Inspect JMX and WebLogic Server logs for unexpected administrative calls that route through Coherence nodes.

Monitoring Recommendations

Enable verbose Coherence security logging and forward events to a centralized analytics platform for retention and correlation.
Monitor process behavior on Coherence hosts for unexpected child processes, outbound connections, or file writes originating from the JVM.
Track configuration and cache definition changes in source control and alert on out-of-band modifications.

How to Mitigate CVE-2026-83410

Immediate Actions Required

Apply the Oracle Critical Patch Update from the Oracle Security Alert September 2026 to all affected Coherence installations.
Inventory Fusion Middleware deployments to identify Coherence versions 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0.
Rotate credentials for service accounts that interact with Coherence, especially any low-privileged accounts reachable over the network.
Restrict network exposure of Coherence cluster and Extend proxy ports to trusted management segments only.

Patch Information

Oracle addressed CVE-2026-83410 in the September 2026 Critical Patch Update. Administrators should download and apply the fixes referenced in the Oracle Security Alert September 2026 and validate cluster health after patching. Follow Oracle's documented upgrade path for the specific Coherence version in use.

Workarounds

Place Coherence clusters behind network segmentation that limits protocol access to trusted application servers only.
Enforce least privilege on Coherence and Fusion Middleware accounts, removing unnecessary access to management interfaces.
Disable or firewall unused Coherence protocols and management endpoints until the patch can be applied.

bash

# Example: restrict Coherence cluster ports to trusted subnet using iptables
iptables -A INPUT -p tcp --dport 7574 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p udp --dport 7574 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 7574 -j DROP
iptables -A INPUT -p udp --dport 7574 -j DROP