CVE-2026-62911

high

Description

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

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911

https://securityaffairs.com/197048/security/microsoft-patch-tuesday-for-august-2026-fixed-a-zero-day-and-wormable-rce.html

https://www.theregister.com/security/2026/08/11/421-bugs-in-microsofts-patch-tuesday-release-and-the-norks-have-already-attacked-one/5286483

https://www.securityweek.com/august-2026-patch-tuesday-microsoft-fixes-421-cves-one-exploited-zero-day/

https://github.com/hypnguyen1209/CVE-2026-62911

Details

Source: Mitre, NVD

Published: 2026-08-11

Updated: 2026-09-01

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8

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

Severity: High

EPSS

EPSS: 0.00732