What is CVE-2026-91391?

CVE-2026-91391 is a low-severity vulnerability in Oracle Corporation Siebel Crm End User, classified under Information Disclosure. CVSS score: 3.7/10. Published 2026-10-20.

How severe is CVE-2026-91391?

Low severity. CVSS v3 base score is 3.7 out of 10.

Information disclosure in Oracle Corporation Siebel Crm End User

CVE-2026-91391

Vulnerability in the Siebel CRM End User product of Oracle Siebel CRM (component: Open UI). 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 End User. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Siebel CRM End User accessible data. CVSS 3.1 Base Score 3.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N).

Vulnerability class: Information Disclosure

Published 2026-10-20 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Oracle Corporation Siebel Crm End User

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

www.oracle.com/security-alerts/cpuoct2026.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-91391?: CVE-2026-91391 is a low-severity vulnerability in Oracle Corporation Siebel Crm End User, classified under Information Disclosure. CVSS score: 3.7/10. Published 2026-10-20.
How severe is CVE-2026-91391?: Low severity. CVSS v3 base score is 3.7 out of 10.