Is CVE-2026-3787 actively exploited?

No active exploitation of CVE-2026-3787 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3787 be exploited remotely?

No. CVE-2026-3787 requires local access to exploit.

What is the CVSS score of CVE-2026-3787?

CVE-2026-3787 has a CVSS score of 7.0 (HIGH).

HOME VULNERABILITIESCVE-2026-3787

HIGH

CVE-2026-3787

CWE-426Published: March 8, 2026· Updated: Mar 10, 2026

7.0

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.2th

Official Description

A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library cryptbase.dll of the component Windows Service. This manipulation causes uncontrolled search path. The attack requires local access. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.

NVD Source

Technical Analysis

CVE-2026-3787 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.