Executive brief
The .NET Framework, a core runtime used by millions of Windows applications, contains a relative path traversal vulnerability that allows an unprivileged attacker to gain elevated system privileges on a local machine. Exploitation requires local access but no special preconditions, potentially allowing an attacker to take complete control of the system and access sensitive data or functionality.
Technical details
A relative path traversal vulnerability in the .NET Framework permits local privilege escalation when the framework resolves file paths using insufficient validation. The vulnerability is triggered through local attack vector; an attacker with standard user privileges can exploit inadequate path handling to access or execute code with elevated privileges. The precise vulnerable component and attack preconditions are not detailed in the available reference material, but the path traversal class suggests the issue stems from improper canonicalization of relative file paths. Patches are expected to be available through Microsoft's standard security update channels.
Affected products
- Microsoft .NET Framework
Timeline
- 2026-08-11: disclosed