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Vulnerabilities & PatchesEmerging1 sourceAug 11, 2026 · 05:00via Zero Day Initiative (Published)

ZDI-26-538: (Pwn2Own) Microsoft Exchange Improper Authorization Privilege Escalation Vulnerability

Brief

This vulnerability allows remote attackers to escalate privileges on affected installations of Microsoft Exchange. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The ZDI has assigned a CVSS rating of 8.

  • The following CVEs are assigned: CVE-2026-62911.
Read more on Zero Day Initiative (Published)→
Vulnerabilities & PatchesCVE-2026-62911Microsoft