Quick answers
- Is CVE-2026-34491 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-34491 being exploited in the wild.
- How severe is CVE-2026-34491?
- Informational severity, published 24 August 2026.
- Which products and versions are affected?
- Johnson Controls Metasys 14 before 14.1.5, 15 before 15.0.1.
- Is there a fix for CVE-2026-34491?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-34491 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-34491?
- Check whether you run Johnson Controls Metasys at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a reflected or stored cross-site scripting (XSS) vulnerability caused by improper neutralization of user-supplied input during web page generation in the Metasys web interface. The vulnerability affects Metasys versions 14 before 14.1.5 and version 15 before 15.0.1. An attacker can craft a malicious link or inject script content that executes in the context of an authenticated user's browser, allowing credential or session token theft. The attack requires either social engineering to trick a user into clicking a link or stored XSS if input validation is bypassed during data storage. Patches are available in Metasys 14.1.5 and 15.0.1.
Affected products
- Johnson Controls Metasys 14 before 14.1.5, 15 before 15.0.1
Timeline
- 2026-08-24: disclosed