CVE-2026-21659Network attack vector

Unauthenticated code execution via relative path traversal

Published Feb 27, 2026 · Updated Feb 27, 2026

Relative path traversal in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to read files and execute code. The controller web application uses a relative path for local file inclusion without neutralizing traversal sequences, but the affected endpoint and parameter are undisclosed. Network access is sufficient and authentication is not required; the vendor reports arbitrary code execution and full compromise, while its CVSS v4 assessment records confidentiality impact only.

CVSS severity8.7
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Relative path traversal in Johnson Controls FRICK Quantum HD 10.22 and earlier allows remote attackers to read files and execute code. The controller web application uses a relative path for local file inclusion without neutralizing traversal sequences, but the affected endpoint and parameter are undisclosed. Network access is sufficient and authentication is not required; the vendor reports arbitrary code execution and full compromise, while its CVSS v4 assessment records confidentiality impact only.

The record

CVE
CVE-2026-21659
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Johnson Controls
Product
FRICK Quantum HD
Classifications
CWE-23, CWE-22, CAPEC-126, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Frick Controls Quantum HD version 10.22 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johnson Controls · FRICK Quantum HDversion=Frick Controls Quantum HD version 10.22 and prior

Published CVSS scores

8.7Johnson ControlsCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC-126Path Traversal
T0866Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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