CVE-2026-83413: 
Oracle Coherence vulnerability analysis and mitigation

CVE-2026-83413 is a tampering vulnerability in the Core component of Oracle Coherence, part of Oracle Fusion Middleware. It affects versions 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0. The vulnerability requires a high-privileged attacker with local logon access to the infrastructure where Oracle Coherence executes, making it difficult to exploit. It carries a CVSS v3.1 base score of 1.9 (Low severity) and was disclosed as part of Oracle's Critical Security Patch Update on September 15, 2026 (Oracle Advisory).

The vulnerability resides in the Core component of Oracle Coherence and is classified as a tampering/integrity issue. Exploitation requires local access to the infrastructure, high privileges, and high attack complexity (CWE classification is not explicitly specified in available sources). A successful attacker can perform unauthorized update, insert, or delete operations on data accessible to Oracle Coherence, but cannot read confidential data or affect availability. No further technical write-ups or proof-of-concept code are publicly available at this time (Oracle Advisory).

Successful exploitation is limited to integrity impacts — specifically, unauthorized update, insert, or delete access to some Oracle Coherence accessible data. There is no confidentiality or availability impact, and the scope is unchanged, meaning the vulnerability does not enable lateral movement beyond the Coherence instance itself. Given the high privilege and local access requirements, the practical risk to most environments is low (Oracle Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation for CVE-2026-83413. The EPSS score is approximately 0.00124, reflecting a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, and no threat actor attribution has been reported (Oracle Advisory).

Oracle has released a patch for CVE-2026-83413 as part of the September 2026 Critical Security Patch Update (CSPU), available as of September 15, 2026. Affected versions (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0, and 15.1.1.0.0) should be patched promptly by following the Fusion Middleware patch availability documentation. As interim measures, organizations should limit local administrative access to infrastructure running Oracle Coherence and restrict high-privileged accounts to only those users who require them (Oracle Advisory).