Critical severity · published Oct 13, 2026
CVE-2026-97381
Legacy Update ActiveX control accepts unauthorized hosting origins
9.9
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LE
LegacyUpdate · LegacyUpdate
>= 1.12.0, < 1.13.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-97381
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-97381
x_refsource_CONFIRM
https://github.com/LegacyUpdate/LegacyUpdate/security/advisories/GHSA-f4g7-4gmx-jfgf
x_refsource_MISC
https://github.com/LegacyUpdate/LegacyUpdate/commit/7d62f0bfaa770d74cd6e2cb0bac9c1907df48033
x_refsource_MISC
https://github.com/LegacyUpdate/LegacyUpdate/commit/ae1c46c97f39a55a1937784d9f9beb30aa9147fd
x_refsource_MISC
https://github.com/LegacyUpdate/LegacyUpdate/releases/tag/v1.13.2.0
x_refsource_MISC
https://legacyupdate.net/news/2026/07/21/legacy-update-1-13-2