CVE-2026-107615

HighCVSS 7.8

Published: 08/10/2026(UTC)Updated: 08/10/2026(UTC)Translated: 08/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.14%

3th percentile - higher than 3% of all known CVEs

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 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.

Risk Assessment

A local user can escalate privileges to SYSTEM, potentially leading to full system compromise.

Recommendation

It is recommended to update TightVNC Server to version 2.8.88 or later and secure installation directories against write access by unauthorized users.

Other vulnerabilities in GlavSoft TightVNC Server

CVE-2026-107612High
Incorrect permission assignment in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to read or overwrite the inter-process communication handles used between the TightVNC service and its desktop server process. The named shared memory segment in the Global\ namespace that carries the pipe HANDLE values is created with a NULL DACL, and its name is derived from a time-seeded srand(time(0)) value that is predictable to one-second granularity. A low-privileged local process can open the mapping and tamper with the IPC channel of a service running as SYSTEM, potentially leading to disclosure of session data, privilege escalation, or denial of service.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS