CVE-2026-107615
DLL search order hijacking via screenhooks libraries in TightVNC Server
- State
- Published
- Severity
- 7.8 High
- Published
- Oct 8, 2026
- Updated
- Oct 8, 2026
- Reserved
- Oct 8, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | securin |
Weaknesses
- CWE-427 Uncontrolled Search Path Element
Affected Products
| Product | Versions |
|---|---|
TightVNCGlavSoft |
|
References
- TightVNC bug #1666issue-tracking
- TightVNC release notes (2.8.88)release-notespatch
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