How severe is CVE-2026-101399?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Oracle Corporation Siebel Apps - Marketing

CVE-2026-101399

Vulnerability in the Siebel Apps - Marketing product of Oracle Siebel CRM (component: Marketing). Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows unauthenticated attacker with network access via SMTP to compromise Siebel Apps - Marketing. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Siebel Apps - Marketing. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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 Apps - Marketing

References

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

Frequently asked questions

What is CVE-2026-101399?: CVE-2026-101399 is a medium-severity vulnerability in Oracle Corporation Siebel Apps - Marketing. CVSS score: 5.3/10. Published 2026-10-20.
How severe is CVE-2026-101399?: Medium severity. CVSS v3 base score is 5.3 out of 10.