CVE-2026-34491

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Cross-Site Scripting in Johnson Controls Metasys

Publication date: 2026-08-24

Last updated on: 2026-09-03

Assigner: Johnson Controls

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Johnson Controls Metasys 14 and Johnson Controls Metasys 15 allows Cross Site Scripting. This issue affects Metasys 14: before 14.1.5; Metasys 15: before 15.0.1.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-24

Last Modified

2026-09-03

Generated

2026-09-14

AI Q&A

2026-08-24

EPSS Evaluated

2026-09-12

NVD

CVE-2026-34491

EUVD

EUVD-2026-65005

Affected Vendors & Products

Vendor	Product	Version / Range
johnson_controls	metasys	to 14.1.5 (exc)
johnson_controls	metasys	to 15.0.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a cross-site scripting (XSS) vulnerability in Johnson Controls Metasys versions 14 and 15. It allows attackers to inject malicious scripts into web pages viewed by users, potentially stealing data or performing unauthorized actions.

Detection Guidance

This vulnerability is a cross-site scripting (XSS) issue in Johnson Controls Metasys versions before 14.1.5 and 15.0.1. Detection typically involves inspecting web application inputs for improper neutralization of user-supplied data. Use tools like web vulnerability scanners (e.g., OWASP ZAP, Burp Suite) to test Metasys web interfaces for XSS flaws. Check server logs for unusual input patterns or script tags in parameters.

Impact Analysis

An attacker could exploit this to steal session cookies, redirect users to malicious sites, or perform actions on behalf of users. This could lead to unauthorized access to sensitive data or system controls.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR (data protection) and HIPAA (health information privacy). Organizations may face fines, legal penalties, and reputational damage if exploited.

Mitigation Strategies

Update Metasys 14 to version 14.1.5 or later and Metasys 15 to version 15.0.1 or later to address the XSS vulnerability.

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