CVE Catalog

CVE-2026-97381

CriticalCVSS 9.9
Published: Translated: NVD NIST

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 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.

Risk Assessment

An attacker can remotely invoke the ActiveX control via a malicious webpage and perform unauthorized system actions, including installing updates or restarting the computer.

Recommendation

Update Legacy Update to version 1.13.2 or later and consider restricting the use of Internet Explorer.

Related vulnerabilities

Original NVD description (English source)

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.

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