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High severity7.8NVD Advisory· Published Jul 14, 2026· Updated Jul 24, 2026

CVE-2026-55009

CVE-2026-55009

Description

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

Affected products

5

Microsoft/Exchange Serverllm-fuzzy4 versions
(expand)+ 3 more
- (no CPE)
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*
Microsoft/Exchange Server Subscription Edition
cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*
Range: <15.02.2562.045

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55009nvdVendor Advisory

News mentions

0

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