---
title: "CVE-2026-107612: GlavSoft TightVNC Server - Broken Access Control"
description: "GlavSoft TightVNC Server for Windows < 2.8.88 contains an incorrect permission assignment caused by a NULL DACL on a named shared memory segment with predictable name, letting local authenticated users read or overwrite IPC handles, exploit requires local authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-107612/
---

# CVE-2026-107612 GlavSoft TightVNC Server - Broken Access Control

GlavSoft TightVNC Server for Windows < 2.8.88 contains an incorrect permission assignment caused by a NULL DACL on a named shared memory segment with predictable name, letting local authenticated users read or overwrite IPC handles, exploit requires local authentication.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.10% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107612)

## Details

Type

Broken Access Control

Impact

Information Disclosure, Privilege Escalation, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-338](https://cwe.mitre.org/data/definitions/338.html)

## Vendor fix

Update to version 2.8.88 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107612](https://nvd.nist.gov/vuln/detail/CVE-2026-107612)
- [https://www.tightvnc.com/whatsnew.php](https://www.tightvnc.com/whatsnew.php)
- [https://sourceforge.net/p/vnc-tight/bugs/1658/](https://sourceforge.net/p/vnc-tight/bugs/1658/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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