A high-severity vulnerability (CVE-2026-83086) exists in Oracle Siebel CRM Cloud Applications, specifically in the Siebel Cloud Manager component. It affects supported versions from 22.3 through 26.7. The vulnerability allows a low-privileged attacker with network access via HTTP to potentially take over the Siebel CRM Cloud Applications. The CVSS 3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Oracle has released security patches addressing this and many other vulnerabilities in their September 2026 Critical Security Patch Update. Customers are strongly advised to apply these patches promptly to mitigate the risk.