An elevation of privilege vulnerability exists in Microsoft Windows when the Windows Secondary Logon Service fails to properly manage requests in memory. An attacker who successfully exploited this vulnerability could run arbitrary code as an administrator. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To exploit this vulnerability, an attacker must first log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system.
The security update addresses the vulnerability by correcting how the Windows Secondary Logon Service handles requests in memory.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1511 for 32-bit Systems | 10586.218 | [KB3147458](https://patchblox.com/security/data/fix/microsoft/kb3147458.md) | Apr 12, 2016 | | Microsoft | Windows 10 Version 1511 for x64-based Systems | 10586.218 | [KB3147458](https://patchblox.com/security/data/fix/microsoft/kb3147458.md) | Apr 12, 2016 | | Microsoft | Windows 10 for 32-bit Systems | | [KB3147461](https://patchblox.com/security/data/fix/microsoft/kb3147461.md) | Apr 12, 2016 | | Microsoft | Windows 10 for x64-based Systems | | [KB3147461](https://patchblox.com/security/data/fix/microsoft/kb3147461.md) | Apr 12, 2016 | --- Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo