Microsoft Security Response CenterCVE-2026-62912

Microsoft Exchange Server Denial of Service Vulnerability

HighVendor CVSS 6.5 / 10 1 CVE Published Aug 11, 2026 at 7:00 AM UTC

Summary

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.

Install KB5121573. Install KB5121574. Install KB5121576. Install KB5121575.

Update history

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

Aug 11, 2026 at 7:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Aug 20, 2026 at 6:50 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.
Oct 28, 2026 at 3:45 AM UTC
Confirmed at the source
Our collector saw this advisory during a later source check.

Details collected from Microsoft Security Response Center.

Official bulletin How SecurityAlert builds this record

Your environment

A vendor advisory can tell you what may be affected. It cannot tell you whether that product and version are installed in your environment.

Keep following

Use the vendor-specific RSS feed or set up alerts for a product your team relies on.

Follow this vendor's RSS feed