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CVE-2026-55023: Microsoft Office Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-55023
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: OfficeInformation disclosure
What
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
Who is affected
Users of Microsoft Office are affected.
Urgency
Remediation is medium urgency due to the potential for information disclosure, but no exploitation is reported.
Action
Update to the latest version of Microsoft Office.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55023

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-2026-55023coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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