CVE-2026-62912: Microsoft Exchange Server Denial of Service Vulnerability
Published Aug 11, 2026
·Updated
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to deny service over a network.
Other sources
Microsoft Exchange Server Denial of Service Vulnerability
— Microsoft
Affected Software
42 affected componentsFixes available
Microsoft Exchange Server 2019=15
15.02.1748.049
Microsoft Exchange Server 2019=14
15.02.1544.044
Microsoft Exchange Server Subscription Edition RTM<15.02.2562.046
15.02.2562.046
Microsoft Exchange Server 2016=23
15.01.2507.072
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
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:04 PM
Data Sourced
via MITRE·05:04 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-62912?
CVE-2026-62912 has a medium severity rating of 6.5.
2
How do I fix CVE-2026-62912?
To mitigate CVE-2026-62912, ensure that you apply the latest security updates provided by Microsoft for Exchange Server.
3
What impact does CVE-2026-62912 have on Microsoft Exchange Server?
CVE-2026-62912 allows an authorized attacker to execute a denial of service attack against Microsoft Exchange Server.
4
Which versions of Microsoft Exchange Server are affected by CVE-2026-62912?
CVE-2026-62912 affects Microsoft Exchange Server 2019, 2016, and the Subscription Edition RTM.
5
What is the nature of the vulnerability in CVE-2026-62912?
CVE-2026-62912 involves deserialization of untrusted data, leading to potential denial of service.