Vulnerability · Published May 6, 2026 · Assigned by jci
CVE-2026-21661AC2000 Uncontrolled Search Path Element
High 8.4
In plain English
A high-severity uncontrolled search path in AC2000 from Johnson Controls. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS 4.0)8.4High
Exploit odds (30 days)0.1%top 98.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Johnson Controls | AC2000 | 10.6 – before release 1011.0 – before release 912 – before release 3 |
Weakness: CWE-427 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N