CVE-2026-21661

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.

CVSS 4.0

8.4CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-26)

CWE

CWE-427

Published

2026-05-06

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://www.johnsoncontrols.com/trust-center/cybersecurity/security-advisories

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