From zdnet.com
![Microsoft](https://zdnet3.cbsistatic.com/hub/i/2019/02/12/745b7ed1-f19c-4718-ad0b-ae7cb7a14fe9/fac8658d4aa5c4bcbda293ab3e1a3d3b/microsoft.png)
Microsoft has published today its monthly roll-up of security updates, known as Patch Tuesday. This month, the OS maker has patched 88 vulnerabilities, among which 21 received a rating of “Critical,” the company’s highest severity ranking.
Furthermore, the May 2019 Patch Tuesday also included fixes for four of the five zero-days that a security researcher and exploit seller by the name of SandboxEscaper published online over the course of the last month.