CVE-2026-44821: Microsoft Office Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-44821

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoft product: Microsoft Office Information disclosure

What: An out-of-bounds read allows unauthorized information disclosure locally.
Who is affected: Users of Microsoft Office.
Urgency: Remediation is medium urgency due to the medium severity of the issue.
Action: Update Microsoft Office to the latest version.

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: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44821

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-2026-448210.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-44821	coverage & exploitation status	NVD · CVE.org

Recent advisories for Microsoft Office 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.

mediumCVE-2026-70105: Improper input validation in Microsoft Office Word allows an unauthorized attacker to disclose…nvd · 2026-08-20
mediumCVE-2026-70328: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose infor…nvd · 2026-08-11
mediumCVE-2026-70327: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose infor…nvd · 2026-08-11
mediumCVE-2026-70325: Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to di…nvd · 2026-08-11
mediumCVE-2026-70323: Improper input validation in Microsoft Office allows an unauthorized attacker to disclose info…nvd · 2026-08-11
mediumCVE-2026-70322: Improper input validation in Microsoft Office PowerPoint allows an unauthorized attacker to di…nvd · 2026-08-11