Microsoft — Exchange Server — Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
Details
EPSS Score
ⓘ
62.10%
99.1th percentile
Confidence
100%
CISA KEV
Date Added
Apr 13, 2026
Patch Due
Apr 27, 2026
Used in ransomware campaigns
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.