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CVE-2026-62911

HighPublished

Microsoft Exchange Server Elevation of Privilege Vulnerability

Published: Aug 11, 2026
Updated: Sep 16, 2026
Assigning CNA: microsoft
Evidence observed: Aug 24, 2026

Primary CVSS

8.0/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

1.3%

Low · next 30 days

Percentile: 69.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Sources

CVE-2026-62911Exploit
Proof-of-concept exploit for CVE-2026-62911: pre-auth RCE on Microsoft Exchange via NTLM relay to MRSProxy, writing an ASPX webshell for SYSTEM command execution.

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