Pwn2Own Berlin

Microsoft Patches Seven Exchange Server Vulnerabilities Including Critical Remote Code Execution Flaw

Microsoft has addressed seven vulnerabilities in Exchange Server that enable remote code execution, privilege escalation, denial of service, content spoofing, and security feature bypass. The most severe issue, CVE-2026-62913, carries a CVSS score of 8.8 and involves a heap buffer overflow that can be exploited remotely by a low-privileged attacker without any user interaction. Successful exploitation grants code execution on the server, facilitating email theft, persistence mechanisms, lateral movement, and ransomware deployment. CVE-2026-62911, demonstrated at Pwn2Own Berlin with a CVSS score of 8.0, allows authentication bypass through capture and replay of credentials. Additional fixes cover SSRF-based privilege escalation, remote deserialization crashes, content spoofing, and authorization bypasses. Patches are available for Exchange Server Subscription Edition, while 2016 and 2019 versions receive updates only through the Extended Security Update program.