Armory Castle exploits BeyondTrust Remote Support flaw CVE-2026-102764 in appliances
Google's threat intelligence group and Mandiant report that a suspected China-nexus actor tracked as Armory Castle has exploited CVE-2026-102764 in BeyondTrust Remote Support appliances since late August 2026. BeyondTrust rates the authentication bypass 9.3 and says it affects Remote Support 26.2.3 and earlier versions. The vendor patched SaaS customers on 8 October 2026 and disclosed the flaw on 15 October, while self-hosted appliances require manual patching unless automatic updates are enabled. According to Mandiant, the attacker used the flaw for initial access, escalated to root, deployed a webshell, and extracted stored credentials to reach downstream systems. Researchers also note that search-engine fingerprint coverage for the product is incomplete, so exposure counts can be misleading in either direction.
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