CVE-2026-21662FMS Employee Allows Upload of Unrestricted Files

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.

4.8 MEDIUMEPSS 0.50%Not in KEVNVD: Analyzed

Last updated: 2026-10-23 23:10 UTC

OverviewCVSS details

4.8MEDIUMCVSS 4.0

Score source: jci (CNA)
NVD status: Analyzed
Published: Jul 31, 2026
Assigner: jci

Affected

FM Systems Employee (Johnson Controls)

Versions: before 2025.3.1
Fixed in: 2025.3.1

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable no · Impact partial

EPSS · FIRST, scored Nov 8

0.50%chance of exploitation in 30 days

Higher than 43.37% of CVEs

CVSS 4.0 · jci (CNA)

4.8Medium

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: High
User interaction: Passive
Confidentiality impact: Low
Integrity impact: Low
Availability impact: None
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · NVD

9.8Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
4.8	MEDIUM	4.0jci (CNA)	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
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CVE ID: CVE-2026-21662
Status: Analyzed
Assigner (CNA): jci
Published: Jul 31, 2026
Last modified: 2026-10-23 23:10 UTC
Weaknesses: CWE-434 · Unrestricted upload of file with dangerous type

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-09 09:25 UTC.