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Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability

Critical Listed in CISA KEV
CVECVE-2023-21529
First seen2026-04-13 00:00 UTC
Disclosed2026-04-13 00:00 UTC
Last updated2026-07-14 19:45 UTC
Channel statuspending_review

Summary

Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • Microsoft:Exchange Server

Sources

  • CISA KEV DATABASE

Original Links

Timeline

  1. kev_added CISA KEV
  2. kev_ingest CISA KEV