---
id: CVE-2026-97381
title: >-
  Legacy Update is a tool for activating and installing updates on legacy
  Windows PCs
summary: >-
  Legacy Update is a tool for activating and installing updates on legacy
  Windows PCs. Legacy Update 1.12.0 through 1.13.1 contains an origin validation
  error in the IsPermitted method of its ActiveX control. After successfully
  reading the…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-346
  - CWE-393
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T22:19:45.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97381'
references:
  - url: >-
      https://github.com/LegacyUpdate/LegacyUpdate/commit/7d62f0bfaa770d74cd6e2cb0bac9c1907df48033
    label: security-advisories@github.com
  - url: >-
      https://github.com/LegacyUpdate/LegacyUpdate/commit/ae1c46c97f39a55a1937784d9f9beb30aa9147fd
    label: security-advisories@github.com
  - url: 'https://github.com/LegacyUpdate/LegacyUpdate/releases/tag/v1.13.2.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/LegacyUpdate/LegacyUpdate/security/advisories/GHSA-f4g7-4gmx-jfgf
    label: security-advisories@github.com
  - url: 'https://legacyupdate.net/news/2026/07/21/legacy-update-1-13-2'
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-13T23:03:54.753Z'
---

## Overview

Legacy Update is a tool for activating and installing updates on legacy Windows PCs. Legacy Update 1.12.0 through 1.13.1 contains an origin validation error in the IsPermitted method of its ActiveX control. After successfully reading the hosting document's hostname, a hostname that is not on the permitted list falls through without setting E_ACCESSDENIED, causing IsPermitted to return S_OK. An attacker who induces a user to visit a malicious webpage in Internet Explorer can invoke the control to enumerate update and system information, install updates without consent, display dialogs, or restart the computer when a reboot is pending. This issue was fixed in Legacy Update 1.13.2.

## Remediation

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