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Recorded 23 Oct 2026 at 08:31 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability

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

What it said

CVE
CVE-2023-21529
Vendor
Microsoft
Product
Exchange Server
CISA KEV
Listed 13 Apr 2026
Known ransomware use
Yes
Federal remediation due
27 Apr 2026

Source evidence when recorded

CISA KEV
IncompleteRead 23 Oct 2026 at 08:14 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

Page history

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Field-level log (1)

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  1. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 00:38 UTC · 256 of 275 readable · 254 fully read · documentation 469/469 current