CVE-2026-91421

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).

• https://www.oracle.com/security-alerts/cpuoct2026.html

Published

Oct 20, 2026

Last Modified

Oct 21, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-91415Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK,…7
• CVE-2026-91417Vulnerability in the Oracle Java SE, Oracle GraalVM Enterpri…5.3
• CVE-2026-91418Vulnerability in the Oracle Java SE, Oracle JavaFX, Oracle G…5.3
• CVE-2026-91419Vulnerability in the Oracle HTTP Server product of Oracle Fu…7.8
• CVE-2026-9142There is an insecure default credentials vulnerability in NI…9.3
• CVE-2026-91420Vulnerability in the Siebel CRM Deployment product of Oracle…6.5
• CVE-2026-91422Vulnerability in the Siebel CRM Deployment product of Oracle…5.3
• CVE-2026-91423Vulnerability in the Siebel CRM Deployment product of Oracle…6
• CVE-2026-91424Vulnerability in the Siebel CRM Deployment product of Oracle…6.4
• CVE-2026-91426Vulnerability in the Siebel CRM Deployment product of Oracle…5.5
• CVE-2026-91427Vulnerability in the Siebel CRM Deployment product of Oracle…2.3
• CVE-2026-91428Vulnerability in the Siebel CRM End User product of Oracle S…4.3