CVE-2026-97381
Legacy Update is a tool for activating and installing updates on legacy Windows PCs
- Risk score
- 62/100
- CVSS
- 9.9 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 t…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.9 critical
References
- https://github.com/LegacyUpdate/LegacyUpdate/commit/7d62f0bfaa770d74cd6e2cb0bac9c1907df48033
- https://github.com/LegacyUpdate/LegacyUpdate/commit/ae1c46c97f39a55a1937784d9f9beb30aa9147fd
- https://github.com/LegacyUpdate/LegacyUpdate/releases/tag/v1.13.2.0
- https://github.com/LegacyUpdate/LegacyUpdate/security/advisories/GHSA-f4g7-4gmx-jfgf
- https://legacyupdate.net/news/2026/07/21/legacy-update-1-13-2
Original 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.
Last activity 13 Oct 2026. Patch Forecast updates every hour.