{"id":"CVE-2026-107615","published":"2026-10-08T14:16:50.313","lastModified":"2026-10-08T21:10:00.133","description":"An uncontrolled search path element vulnerability in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to execute arbitrary code with SYSTEM privileges. DynamicLibrary::init() (and ThemeLib) load screenhooks32.dll / screenhooks64.dll with LoadLibrary() using a bare file name and no LOAD_LIBRARY_SEARCH_* flags, so the TightVNC service follows the default DLL search order and loads an attacker-planted DLL from a writable directory earlier in that order (for example, an installation directory with permissive ACLs).","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-427"],"vendors":[],"products":[],"references":[{"url":"https://sourceforge.net/p/vnc-tight/bugs/1666/","tags":[]},{"url":"https://www.tightvnc.com/whatsnew.php","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A local authenticated user can exploit an uncontrolled search path element vulnerability in TightVNC Server to load a malicious DLL with SYSTEM privileges. This occurs because the application loads screenhooks32.dll/screenhooks64.dll without specifying search path flags, allowing attackers to place malicious DLLs in writable directories earlier in the search order.","exploitability":"Exploitation requires local authentication and access to a writable directory in the DLL search path, making it moderately difficult but possible for attackers with user-level access to achieve SYSTEM-level code execution.","blast_radius":"If exploited, this vulnerability could allow attackers to execute arbitrary code with SYSTEM privileges on Windows systems running TightVNC Server versions before 2.8.88, potentially leading to full system compromise.","remediation":"Upgrade to TightVNC Server 2.8.88 or later to remediate this vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","dll-injection","vnc","privilege-escalation"],"model":"garnet-coder","analyzedAt":"2026-10-16T09:22:14.835Z"}}