CVE-2026-62911: Microsoft Exchange Server Elevation of Privilege Vulnerability
Published Aug 11, 2026
·Updated
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Other sources
Microsoft Exchange Server Elevation of Privilege Vulnerability
— Microsoft
Affected Software
42 affected componentsFixes available
Microsoft Exchange Server 2019=15
15.02.1748.049
Microsoft Exchange Server 2016=23
15.01.2507.072
Microsoft Exchange Server Subscription Edition RTM<15.02.2562.046
15.02.2562.046
Microsoft Exchange Server 2019=14
15.02.1544.044
Microsoft Exchange Server=2016
Microsoft Exchange Server=2016-cumulative_update_1
Microsoft Exchange Server=2016-cumulative_update_10
Microsoft Exchange Server=2016-cumulative_update_11
Microsoft Exchange Server=2016-cumulative_update_12
Microsoft Exchange Server=2016-cumulative_update_13
Microsoft Exchange Server=2016-cumulative_update_14
Microsoft Exchange Server=2016-cumulative_update_15
Microsoft Exchange Server=2016-cumulative_update_16
Microsoft Exchange Server=2016-cumulative_update_17
Microsoft Exchange Server=2016-cumulative_update_18
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2016-cumulative_update_2
Microsoft Exchange Server=2016-cumulative_update_20
Microsoft Exchange Server=2016-cumulative_update_21
Microsoft Exchange Server=2016-cumulative_update_22
Microsoft Exchange Server=2016-cumulative_update_3
Microsoft Exchange Server=2016-cumulative_update_4
Microsoft Exchange Server=2016-cumulative_update_5
Microsoft Exchange Server=2016-cumulative_update_6
Microsoft Exchange Server=2016-cumulative_update_7
Microsoft Exchange Server=2016-cumulative_update_8
Microsoft Exchange Server=2016-cumulative_update_9
Microsoft Exchange Server=2019
Microsoft Exchange Server=2019-cumulative_update_1
Microsoft Exchange Server=2019-cumulative_update_10
Microsoft Exchange Server=2019-cumulative_update_11
Microsoft Exchange Server=2019-cumulative_update_12
Microsoft Exchange Server=2019-cumulative_update_13
Microsoft Exchange Server=2019-cumulative_update_2
Microsoft Exchange Server=2019-cumulative_update_3
Microsoft Exchange Server=2019-cumulative_update_4
Microsoft Exchange Server=2019-cumulative_update_5
Microsoft Exchange Server=2019-cumulative_update_6
Microsoft Exchange Server=2019-cumulative_update_7
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2019-cumulative_update_9
Microsoft Exchange Server Subscription Edition<15.02.2562.046
Remediation
Event History
Aug 11, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:06 PM
Data Sourced
via MITRE·05:06 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Sep 1, 2026
News Published
via BleepingComputer·12:38 PM
News Published
via BleepingComputer·12:42 PM
Frequently Asked Questions
1
What is the severity of CVE-2026-62911?
CVE-2026-62911 has a severity rating of high, with a CVSS score of 8.
2
How do I fix CVE-2026-62911?
To mitigate CVE-2026-62911, apply the latest security updates provided by Microsoft for Exchange Server.
3
What systems are affected by CVE-2026-62911?
CVE-2026-62911 affects Microsoft Exchange Server 2019, Microsoft Exchange Server 2016, and Microsoft Exchange Server Subscription Edition.
4
What type of vulnerability is CVE-2026-62911?
CVE-2026-62911 is an elevation of privilege vulnerability due to an authentication bypass.
5
Can an attacker remotely exploit CVE-2026-62911?
Yes, CVE-2026-62911 can be exploited remotely by an authorized attacker to elevate their privileges.