CVE-2026-45466: Microsoft Word Information Disclosure Vulnerability

lowCVSS 3.3CVE-2026-45466

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoft product: Word Information disclosure

What: Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Who is affected: Users of Microsoft Word.
Urgency: Remediation is low priority due to the low severity of the vulnerability.
Action: Update Microsoft Word to the latest version.

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

⚡ Watch Word

Get an email when a new Word advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 3.3
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45466

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.

Low exploitation riskCVE-2026-454660.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45466	coverage & exploitation status	NVD · CVE.org

Recent advisories for Microsoft Word Information

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.

criticalexploitedCVE-2023-36761: Microsoft Word Information Disclosure Vulnerabilitycisa-kev · 2023-09-12