9.9

CVE-2026-97381

CVSS: 9.9v3.1CriticalReceived
Published 2026-10-13Last modified 2026-10-13
Open JSON

Vulnerability summary

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.9/10
010
Critical · v3.1 (cve.org)
EPSS score
0.21%
0%100%
Low · Change unavailable
KEVNot listed0 of 3 catalogs
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 2026-10-13
    PublishedVulnerability first disclosed.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

2026-10-142026-10-14
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Legacyupdate1 product
  • legacyupdate≥ 1.12.0, < 1.13.2

1 vendor · 1 product

References

5 links