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CVE-2026-50678: Microsoft Excel Information Disclosure Vulnerability

mediumCVSS 6.6CVE-2026-50678
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Microsoft Office ExcelInformation disclosure
What
Heap-based buffer overflow allows an unauthorized attacker to disclose information locally.
Who is affected
Users of Microsoft Office Excel.
Urgency
Remediation is important due to medium severity and potential for information disclosure.
Action
Update Microsoft Office Excel to the latest version to resolve the issue.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.6
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50678

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-2026-50678coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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