Local information disclosure via out-of-bounds read
Published Jul 14, 2026 · Updated Jul 14, 2026
Out-of-bounds read in Microsoft Office and SharePoint Server allows local users to disclose information through user interaction. Microsoft identifies the flaw only at the Office-suite level and has not disclosed the affected parser, file format, or code path that reads beyond a buffer boundary. Exploitation is local and requires user interaction; the reported consequence is information disclosure, with no integrity or availability impact.
Summary
What happened
Out-of-bounds read in Microsoft Office and SharePoint Server allows local users to disclose information through user interaction. Microsoft identifies the flaw only at the Office-suite level and has not disclosed the affected parser, file format, or code path that reads beyond a buffer boundary. Exploitation is local and requires user interaction; the reported consequence is information disclosure, with no integrity or availability impact.
The record
- CVE
- CVE-2026-55023
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-125, T1204
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.111.26071215
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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