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High severity · published May 6, 2026
CVE-2026-21661
AC2000 Uncontrolled Search Path Element
8.4
CVSS
0.1%
EPSS
No
On KEV
Description
An Uncontrolled Search Path Element vulnerability in JohnsonControls AC2000 on Windows allows Leveraging/Manipulating Configuration File Search Paths. This issue affects AC2000: from 10.6 before release 10, from 11.0 before release 9, from 12 before release 3.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
AC2000 · Johnson Controls
10.6 before release 10; 11.0 before release 9; 12 before release 3 · source: vendor
Affected product
AC
AC2000
Johnson Controls
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21661
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21661
www.johnsoncontrols.com
https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories