Executive brief
A security vulnerability exists in the Windows Remote Procedure Call (RPC) Runtime, a core component that allows different programs to communicate with each other. An attacker who already has basic access to a computer could exploit this flaw to gain higher-level administrative permissions. This could allow them to take full control of the system, access restricted data, or disrupt operations.
Technical details
An improper authorization vulnerability (CWE-285) exists within the Microsoft Windows RPC Runtime. The flaw allows a local attacker with low-level privileges to bypass authorization checks during RPC calls. By successfully exploiting this vulnerability, an attacker can elevate their privileges to a higher level, potentially gaining SYSTEM-level access. The attack requires local access and prior authentication but no user interaction. Microsoft has released security updates to address this issue across various versions of Windows 10, Windows 11, and Windows Server.
Affected products
- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 Standard and Server Core
Timeline
- 2026-07-14: disclosed: Initial publication by Microsoft and NVD.
- 2026-07-14: advisory: Microsoft Security Response Center (MSRC) published the update guide.