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CVE-2026-45643: Microsoft Word Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-45643
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: Microsoft WordRemote code execution
What
An untrusted pointer dereference allows an unauthorized attacker to execute code locally.
Who is affected
Users of Microsoft Office Word.
Urgency
Remediation is urgent due to the high severity of the vulnerability.
Action
Apply the latest security updates for Microsoft Word.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45643

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45643coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Word Remote

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center