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

ZDI-26-534: (Pwn2Own) Microsoft Exchange Capture-Replay Authentication Bypass Vulnerability

Brief

This vulnerability allows remote attackers to bypass authentication on affected installations of Microsoft Exchange. Authentication is not required to exploit this vulnerability. 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