Head Mare APT Exploits TrueConf Server Flaws to Spread PhantomCore Malware

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The Head Mare APT group has been actively exploiting two critical vulnerabilities, CVE-2026-72529 and CVE-2026-72530, in unpatched TrueConf Server installations to deliver the PhantomCore malware. Attackers chain the two flaws via port 4307/TCP to execute code, escape sandboxed environments, and plant a web shell granting privileged database access. They then replace the official TrueConf Windows client installer with a trojanized version, causing conference participants to unknowingly install PhantomCore alongside the legitimate client during routine updates. Kaspersky ICS CERT published its findings on August 12, 2026, and both CVEs have since been added to the CISA Known Exploited Vulnerabilities catalog. Administrators are urged to upgrade to TrueConf Server versions 5.3.9, 5.4.9, or 5.5.5 and restrict access to port 4307/TCP to trusted networks immediately.

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