CVE-2026-91421: Medium severity Oracle Siebel CRM Deployment vulnerability
Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.9. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Affected Software
Event History
Frequently Asked Questions
Which systems should be prioritized for assessment?
Prioritize Oracle Siebel CRM Deployment instances using the Server Infrastructure component on supported versions 17.0 through 26.9, particularly where the service is reachable over HTTP from untrusted networks.
Does exploitation require an account or user interaction?
No. The vulnerability can be exploited by an unauthenticated attacker with network access via HTTP, and no user interaction is required. Exploitation is described as difficult, reflecting high attack complexity.
What is the expected impact of a successful attack?
A successful attack can cause the affected deployment to hang or repeatedly crash, resulting in complete denial of service. The provided CVSS information indicates no confidentiality or integrity impact.