CVE-2026-91390

Analyzed Analyzed - Analysis Complete

Cross-Site Scripting in 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 low privileged attacker with network access via HTTP to compromise Siebel CRM End User. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Siebel CRM End User, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Siebel CRM End User accessible data as well as unauthorized read access to a subset of Siebel CRM End User accessible data. CVSS 3.1 Base Score 5.4 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).

CVSS Scores

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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-2026-91390

EUVD

EUVD-2026-106644

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-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability affects Oracle Siebel CRM End User versions 17.0 to 26.9. It allows a low-privileged attacker with network access via HTTP to potentially compromise the system. Exploitation requires human interaction from someone other than the attacker and may impact additional products.

Detection Guidance

Detection requires checking for Oracle Siebel CRM End User versions 17.0-26.9. Inspect installed software versions and network traffic for HTTP access to Siebel CRM components. No specific commands are provided in the context.

Impact Analysis

An attacker could gain unauthorized access to read, update, insert, or delete some data within Siebel CRM End User. This could lead to data breaches or unauthorized modifications of sensitive information.

Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA due to unauthorized read and write access to sensitive data in Siebel CRM End User. Unauthorized data access could lead to violations of confidentiality and integrity requirements under these regulations.

Mitigation Strategies

Apply Oracle's official patches or updates for Siebel CRM End User versions 17.0-26.9. Restrict network access to HTTP interfaces and limit privileges for users accessing the system.

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EPSS Chart

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