CVE-2026-83415 in Coherence
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Difficult to exploit vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Coherence. Successful attacks of this vulnerability can result in takeover of Oracle Coherence. CVSS 3.1 Base Score 7.5 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Core component of Oracle Coherence, a high-performance distributed caching system that is an integral part of the Oracle Fusion Middleware suite. This security flaw affects specific supported versions including 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. The nature of this vulnerability is characterized as difficult to exploit, which implies a high complexity in the attack vector requirements despite its severe potential impact. It allows an attacker with low privileges and network access via HTTP to compromise the Oracle Coherence infrastructure. This classification indicates that while the barrier to entry for exploitation is relatively high due to technical complexities or specific conditions required, the resulting consequences are catastrophic for the affected system.
From a technical perspective, this vulnerability enables unauthorized actors to gain control over the Oracle Coherence environment. The ability of a low-privileged attacker with network access via HTTP to achieve full takeover suggests a critical failure in authentication mechanisms, input validation, or session management within the core processing logic. Such flaws typically stem from improper handling of user-supplied data that leads to arbitrary code execution, privilege escalation, or memory corruption. Because the attack vector is specified as Network and requires only Low Privileges with no User Interaction, it highlights a remote exploitable weakness in the service's exposure surface. The complexity being rated as High suggests that successful exploitation may require precise timing, specific environmental configurations, or complex payload construction to bypass existing security controls or trigger the underlying flaw reliably.
The operational impact of this vulnerability is severe, as evidenced by its CVSS 3.1 Base Score of 7.5, which denotes a High severity rating. The vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) confirms that the attack impacts Confidentiality, Integrity, and Availability equally with high impact scores. A successful exploitation results in complete takeover of Oracle Coherence, meaning an attacker can read sensitive data stored within the cache, modify or delete critical application state information, and disrupt service availability for dependent applications. In enterprise environments where Oracle Coherence is used to manage session states, real-time analytics, or distributed computing tasks, such a compromise can lead to widespread data breaches, financial loss due to operational downtime, and reputational damage. The lack of scope change (S:U) indicates that the impact is largely contained within the vulnerable component itself, but since Coherence often serves as a backbone for other middleware components, lateral movement or cascading failures are significant risks.
This vulnerability aligns with common weakness enumerations such as CWE-20 Improper Input Validation and potentially CWE-78 OS Command Injection if code execution is involved, depending on the specific technical root cause not detailed in the summary. In terms of adversary tactics, this falls under MITRE ATT&CK techniques related to Initial Access via Network Service Exploitation and Privilege Escalation within a single host or container environment. The requirement for network access over HTTP places it squarely in the context of web-based service exploitation, making it relevant to organizations exposing Coherence clusters to internal networks without sufficient segmentation or additional security layers like Web Application Firewalls that might detect anomalous request patterns associated with such complex exploits.
Mitigation strategies must prioritize immediate patching to the latest available version provided by Oracle for each affected release line. Organizations should verify their inventory of Oracle Fusion Middleware instances against the supported versions listed and apply the relevant CPU (Critical Patch Update) or PSU (Patch Set Update) as soon as feasible. In scenarios where immediate patching is not possible due to operational constraints, temporary mitigations should be implemented. These include restricting network access to Coherence services through strict firewall rules that limit HTTP traffic only from trusted application servers and internal subnets rather than exposing it broadly across the enterprise network. Additionally, implementing strong authentication mechanisms such as mutual TLS or integrating with centralized identity providers can help ensure that even if a low-privileged account is compromised, further lateral movement is hindered. Regular vulnerability scanning focused on middleware components and monitoring for unusual HTTP request patterns indicative of exploitation attempts are also recommended defensive measures to detect potential attacks in progress.