Johnson Controls Metasys XSS Vulnerability Allows Session Hijacking
CISA warns of a persistent XSS vulnerability (CVE-2026-34491) in Johnson Controls Metasys versions 12-15. A low-privilege user can inject a malicious payload via crafted URL, executing in other users' sessions, including admins, leading to session hijacking. Patches available for 15.0.1; 14.1.5 due July 2026.
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Summary last validated Aug 24, 2026
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