# CVE-2026-101399: Oracle Siebel CRM Apps - Marketing partial denial of service via SMTP

Source: https://junglewise.ai/threats/cve-2026-101399-vulnerability-in-the-siebel-apps-marketing-product-of-oracle  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-101399 · Severity: medium · CVSS 5.3 · Published 2026-10-20

Oracle Siebel CRM is a customer relationship management platform used by businesses to manage marketing campaigns and customer interactions. A flaw in the Marketing component allows an unauthenticated attacker to send specially crafted messages via SMTP to partially disrupt the marketing application's availability. An attacker could exploit this to degrade service without needing valid credentials or user interaction.

Technologies: [Oracle Siebel CRM Apps Marketing](https://junglewise.ai/threats/technologies/siebel-crm-apps-marketing). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-101399 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101399 being exploited in the wild.

**How severe is CVE-2026-101399?** Medium severity, with a CVSS score of 5.3, published 20 October 2026.

**Which products and versions are affected?** Oracle Siebel CRM Apps Marketing 17.0–26.9.

**Is there a fix for CVE-2026-101399?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101399 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-101399?** Check whether you run Oracle Siebel CRM Apps Marketing at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An easily exploitable vulnerability in the Marketing component of Oracle Siebel CRM versions 17.0–26.9 permits unauthenticated network-based attacks via SMTP to cause partial denial of service. The attack requires no authentication, user interaction, or complex configuration, resulting in degraded availability of the affected application. A fix is available in patched versions following the October 2026 CPU release.

## Affected products

- Oracle Siebel CRM Apps - Marketing 17.0–26.9

## Timeline

- 2026-10-20: advisory

## References

- [https://www.oracle.com/security-alerts/cpuoct2026.html](https://www.oracle.com/security-alerts/cpuoct2026.html)

## Related threats

- [Oracle Siebel CRM Apps - Marketing data disclosure](https://junglewise.ai/threats/cve-2026-101392-vulnerability-in-the-siebel-apps-marketing-product-of-oracle)
- [Oracle Siebel CRM Apps Marketing privilege escalation](https://junglewise.ai/threats/cve-2026-73966-oracle-siebel-crm-apps-marketing-privilege-escalation)