FMS Employee Allows Upload of Unrestricted Files

published 2026-07-31 3 mo ago modified 2026-10-23 16 d ago also EUVD-2026-51588

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

Johnson Controls FM Systems Employee 2025.3.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-211-02 updated 2026-07-30 cvss 2.4

Johnson Controls OpenBlue Employee

Johnson Controls Inc. OpenBlue Employee (FMS Employee) <=V2025.3.1
affected: mitigation “Limit application access to authorized users and enforce strong authentication.” johnsoncontrols.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 3 mo ago (2026-07-31)

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	4.8	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CNA	4.0	4.8	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Johnson Controls FM Systems Employee

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type

References

johnsoncontrols.com /trust-center/cybersecurity/security-advisories
vendor-advisory

Sources

CVE List CVE-2026-21662
NVD CVE-2026-21662

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary