CVE-2026-107615 — DLL search order hijacking via screenhooks libraries in TightVNC Server

Description (CNA)

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).

Affected (CNA)

Vendor / product	Versions
GlavSoft / TightVNC	affected 0 before 2.8.88

CWE

CWE-427

References

https://sourceforge.net/p/vnc-tight/bugs/1666/
https://www.tightvnc.com/whatsnew.php

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.