ZDI-26-535: (Pwn2Own) Microsoft Exchange External Control of File Path Remote Code Execution Vulnerability
ZDI advisory discloses Microsoft Exchange remote code execution flaw (CVE-2026-62911, CVSS 7.2) with bypassable authentication.
ZDI advisory ZDI-26-535 describes an external control of file path vulnerability in Microsoft Exchange, tracked as CVE-2026-62911 with a CVSS score of 7.2. Remote attackers can execute arbitrary code on affected installations. Although authentication is required, the existing authentication mechanism can be bypassed.
- Remote code execution in Microsoft Exchange
- CVE-2026-62911, CVSS 7.2, disclosed via Pwn2Own
- Required authentication mechanism can be bypassed
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-62911 | Capture-Replay Authentication Bypass in Microsoft Exchange Server | 8.0 | <1% | PoC ×2 |
From the original article
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.
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