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

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. 8. The following CVEs are assigned: CVE-2026-62911.

·Zero Day Initiative (Published)
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Vulnerabilities & Patches
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ZDI-26-535: (Pwn2Own) Microsoft Exchange External Control of File Path Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code 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 7. 2. The following CVEs are assigned: CVE-2026-62911.

·Zero Day Initiative (Published)
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Vulnerabilities & Patches
Emerging1 src

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

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. 1. The following CVEs are assigned: CVE-2026-62911.

·Zero Day Initiative (Published)
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