Quick answers
- Is CVE-2026-21662 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21662 being exploited in the wild.
- How severe is CVE-2026-21662?
- Informational severity, with a CVSS score of 4.8, published 31 July 2026.
- Which products and versions are affected?
- Johnson Controls FM Systems Employee before 2025.3.1.
- Is there a fix for CVE-2026-21662?
- A patch was published on 2025.3.1: Vulnerability fixed in this version Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-21662 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-21662?
- Check whether you run Johnson Controls FM Systems Employee 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
An unrestricted file upload vulnerability (CWE-434) exists in Johnson Controls FM Systems Employee versions prior to 2025.3.1. The flaw allows an authenticated attacker with high privileges (PR:H) to upload files of dangerous types to the server. Exploitation requires some level of user interaction (UI:P). Successful exploitation could allow the attacker to place malicious files on the system, potentially leading to code execution or data manipulation depending on the server configuration. The issue is addressed in version 2025.3.1.
Affected products
- Johnson Controls FM Systems Employee before 2025.3.1
Timeline
- 2026-07-31: advisory: Initial disclosure by Johnson Controls
- 2025.3.1: patched: Vulnerability fixed in this version