Is CVE-2026-91428 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91428 being exploited in the wild.

How severe is CVE-2026-91428?

Medium severity, with a CVSS score of 4.3, published 20 October 2026.

Which products and versions are affected?

Oracle Siebel CRM End User 17.0-26.9.

Is there a fix for CVE-2026-91428?

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-2026-91428 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-91428?

Check whether you run Oracle Siebel CRM End User 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.

CVE-2026-91428: Oracle Siebel CRM End User Cross-Site Request Forgery in Open UI

CVE-2026-91428 · Severity: medium · CVSS 4.3 · Published 2026-10-20

Oracle Siebel CRM is a customer relationship management platform that manages business interactions and data. This vulnerability in the Open UI component allows an attacker to trick a legitimate user into unknowingly modifying or deleting CRM data through a malicious webpage or link. While the flaw requires user interaction, it could lead to unauthorized changes to sensitive business information without the user's knowledge.

Technologies: Oracle Siebel CRM End User. Vendors: Oracle.

Quick answers

Is CVE-2026-91428 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91428 being exploited in the wild.
How severe is CVE-2026-91428?: Medium severity, with a CVSS score of 4.3, published 20 October 2026.
Which products and versions are affected?: Oracle Siebel CRM End User 17.0-26.9.
Is there a fix for CVE-2026-91428?: 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-2026-91428 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-91428?: Check whether you run Oracle Siebel CRM End User 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 Siebel CRM End User's Open UI component permits unauthenticated attackers to perform unauthorized data modifications via HTTP. The attack requires social engineering a user to visit a malicious site or click a crafted link, after which the attacker gains write access to some accessible CRM data. The vulnerability affects versions 17.0 through 26.9.

Affected products

Oracle Siebel CRM End User 17.0-26.9

Timeline

2026-10-20: disclosed

References

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

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.