CVE-2026-91428

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in Oracle Siebel CRM End User

Publication date: 2026-10-20

Last updated on: 2026-11-04

Assigner: Oracle

Description

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. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM End User. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Siebel CRM End User accessible data. CVSS 3.1 Base Score 4.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N).

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-20

Last Modified

2026-11-04

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91428

EUVD

EUVD-2026-106678

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	siebel_crm	From 17.0 (inc) to 26.9 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-601	The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Siebel CRM End User (versions 17.0-26.9) that allows an unauthenticated attacker to potentially modify data in the system through a network-based HTTP attack. The attack requires user interaction and has a low impact on integrity according to CVSS scoring.

Detection Guidance

Detection requires monitoring for unauthorized access attempts to the Siebel CRM End User component via HTTP. Check web server logs for unusual requests targeting the Open UI interface. Look for repeated failed login attempts or unexpected data modification patterns in the application logs.

Impact Analysis

An attacker could exploit this to change or delete data in your Siebel CRM system, potentially leading to incorrect records, data loss, or other integrity issues. Since it requires user interaction, phishing or social engineering might be needed.

Compliance Impact

This vulnerability allows unauthorized modification of data in Siebel CRM End User, which could lead to violations of data integrity requirements in GDPR and HIPAA. Unauthorized changes to personal or health data could result in non-compliance with these regulations.

Mitigation Strategies

Apply the latest Oracle Siebel CRM patches immediately. Restrict network access to the Siebel CRM End User component via firewall rules. Monitor for suspicious activity and disable unnecessary HTTP interfaces if possible.

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EPSS Chart

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