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CVE-2026-21662

FMS Employee Allows Upload of Unrestricted Files

Published: Jul 31, 2026Updated: Aug 6, 2026 Sources: CVE List NVD csafCWE-434
2.4LOW
NVD MITRE
EPSS Score
0.4%
Top 66.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:RS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-434

Affected Products

Johnson Controls
commercial·USaka jci, metasys, exacqvision, frick controls quantum hd
FM Systems EmployeeOn-prem
ICS / OT / IoT / building-automation

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

3 techniques
Command and Control
Initial Access
Persistence
View detailed technique mapping

References

https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories
johnsoncontrols.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-211-02.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-02
cisa.gov
and 19 more references View all →

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