---
id: CVE-2026-107615
title: >-
  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
summary: >-
  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 screen…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-427
vendor: GlavSoft
product: TightVNC
affected:
  - TightVNC < 2.8.88
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:10:00.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107615'
references:
  - url: 'https://sourceforge.net/p/vnc-tight/bugs/1666/'
    label: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
  - url: 'https://www.tightvnc.com/whatsnew.php'
    label: 33c584b5-0579-4c06-b2a0-8d8329fcab9c
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-08T14:00:03.531511Z'
ingestedAt: '2026-10-08T14:47:16.341Z'
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.