CVE-2026-55009

Summary

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

Affected Software

VendorProductVersion RangeStatus
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 2315.01.0.0 < 15.01.2507.071affected
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1415.02.0.0 < 15.02.1544.043affected
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 1515.02.0.0 < 15.02.1748.048affected
MicrosoftMicrosoft Exchange Server Subscription Edition RTM15.02.0.0 < 15.02.2562.045affected

Weaknesses

  • CWE-502: CWE-502: Deserialization of Untrusted Data

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References