CVE-2026-62871

This bug is in the .NET software used by many Windows applications and development tools. If someone already has local access to your computer and tricks a user into opening a specially crafted file or component, it could let them run code under the privileges of the affected app/process.

Think of it like a security weakness in how .NET handles data in memory: the attacker’s goal is to “break” the program’s memory handling in a way that turns into real control of the machine.

This matters if your business runs software that uses the .NET framework (including .NET 8.0 and .NET 9.0) or if your developers have Microsoft Visual Studio installed for those versions (Visual Studio 2022 version 17.14 or Visual Studio 2026 version 18.8).

Because exploitation requires local access and user interaction (someone must interact with a crafted file/component), it’s mainly a risk on machines where an attacker can get a foothold locally—for example, on shared devices, workstations accessible by untrusted users, or after an initial compromise. No authentication is required for the vulnerable action itself, but a local attacker is still required.

This should be treated as urgent because the flaw can enable local attackers to execute arbitrary commands on the computer where .NET runs once they can get local access and trigger user interaction with a crafted file/component.

Even though there’s no confirmed dated public exploitation report in the provided sources, the update is new and there’s patch-driven activity signaling it’s worth acting on immediately for systems that could be touched by untrusted users.