CVE-2026-91209

Analyzed Analyzed - Analysis Complete

Memory Corruption in Oracle Solaris X Window System

Publication date: 2026-10-20

Last updated on: 2026-11-09

Assigner: Oracle

Description

Vulnerability in the Oracle Solaris product of Oracle Systems (component: X Window System). The supported version that is affected is 11.4. Difficult to exploit vulnerability allows low privileged attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. 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 Oracle Solaris accessible data as well as unauthorized read access to a subset of Oracle Solaris accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Solaris. CVSS 3.1 Base Score 4.2 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L).

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Meta Information

Published

2026-10-20

Last Modified

2026-11-09

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91209

EUVD

EUVD-2026-106464

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	solaris	11.4

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 is a vulnerability in Oracle Solaris 11.4's X Window System component. It allows a low-privileged attacker with local access to potentially compromise the system. Exploitation requires another user's interaction and can lead to unauthorized data access or partial denial of service.

Detection Guidance

Detection of CVE-2026-91209 requires checking for vulnerable versions of Oracle Solaris 11.4 and examining the X Window System component for potential misconfigurations or unauthorized modifications. Review system logs for unusual activity related to the X Window System and ensure all patches for Oracle Solaris 11.4 are applied.

Impact Analysis

If exploited, an attacker could read, modify, or delete some data on your Oracle Solaris system. They might also cause partial service disruptions. The impact is limited due to the need for local access and user interaction.

Compliance Impact

This vulnerability allows unauthorized read access to data and partial denial of service, which could lead to unauthorized exposure of sensitive information. This may impact compliance with GDPR (data confidentiality requirements) and HIPAA (protected health information integrity and availability).

Mitigation Strategies

Apply the latest Oracle Solaris patches from Oracle to address the X Window System vulnerability. Ensure only trusted users have logon access to systems running Oracle Solaris 11.4. Monitor for unauthorized changes to system data or unexpected partial denial of service conditions.

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EPSS Chart

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