Executive brief
A security vulnerability has been identified in the Microsoft Windows App Store that could allow an authorized user to access sensitive information they should not be able to see. This issue affects various versions of Windows 10, Windows 11, and Windows Server. An attacker who already has access to the system could exploit this to compromise data integrity or confidentiality, potentially leading to further unauthorized activities on the device.
Technical details
A vulnerability classified as 'Use of Uninitialized Resource' (CWE-908) exists within the Microsoft Windows App Store component. The flaw allows a locally authenticated attacker with low privileges to gain access to sensitive information or potentially modify data by interacting with uninitialized memory resources. The attack vector is local, requiring the attacker to have an existing account on the target system, but no user interaction is required. Microsoft has released security updates to address this issue across affected versions of Windows 10, 11, and Server 2016.
Affected products
- Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
- Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
- Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
- Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2269
- Microsoft Windows Server 2016 10.0.14393.0 to 10.0.14393.9339
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory