CVE-2026-91388

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. Difficult to exploit 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 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 4.7 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/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-2026-91388

EUVD

EUVD-2026-106642

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 an unauthenticated 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

This vulnerability is specific to Oracle Siebel CRM End User and requires network access via HTTP. Detection involves checking for unauthorized data access or modifications in the Siebel CRM application logs or database. Monitor for unusual HTTP requests targeting the Siebel CRM Open UI component. Ensure all Siebel CRM instances are updated to versions 17.0-26.9 or apply vendor patches if available.

Impact Analysis

Successful exploitation could lead to unauthorized updates, inserts, or deletes of data accessible by Siebel CRM End User. It may also allow unauthorized reading of a subset of that data. The impact is limited to data within the CRM system.

Compliance Impact

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

Mitigation Strategies

Apply the latest security patches from Oracle for Siebel CRM End User versions 17.0-26.9. Restrict network access to HTTP ports used by Siebel CRM. Monitor for unusual data access or modification attempts in Siebel CRM logs.

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EPSS Chart

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