PatchTheCVECVE-2026-21662: Unrestricted upload of file with dangerous type vulnerability in Johnson Controls FM Systems Employee allows U
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CRITICAL 9.8REMOTEUPGRADE
CVE-2026-21662 is a critical-severity flaw (CVSS 9.8) affecting fms employee. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Unrestricted upload of file with dangerous type vulnerability in Johnson Controls FM Systems Employee allows Using Malicious Files. This issue affects FM Systems Employee: before 2025.3.1.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.5% (top 58%) |
| CISA exploited list | No |
| Weakness | CWE-434 |
| Published | 2026-07-31 |
| Last modified | 2026-10-23 |
Publisher (CNA): Johnson Controls · Vendor: johnsoncontrols
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
johnsoncontrols fms employee UPGRADE
Affected: <= 2025.3.1
Fixed in: newer than 2025.3.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy fms-employee || rpm -q fms-employee || fms-employee --version
2. UPGRADE to newer than 2025.3.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade fms-employee
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade fms-employee
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Exact fixes by distribution
Fedora 46 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2026-34495 MEDIUM 5.4 UPGRADE Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Johnson
- CVE-2026-34497 MEDIUM 5.4 UPGRADE Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Johnson Control