Local information disclosure via buffer over-read
Published Sep 8, 2026 · Updated Sep 9, 2026
A buffer over-read in affected Microsoft Office Word builds allows context-dependent attackers to disclose information through local processing. Microsoft has not disclosed the affected parser, data structure, or missing bounds check that causes Word to read beyond a buffer. Exploitation requires user interaction with attacker-controlled content, and the reported consequence is information disclosure only.
Summary
What happened
A buffer over-read in affected Microsoft Office Word builds allows context-dependent attackers to disclose information through local processing. Microsoft has not disclosed the affected parser, data structure, or missing bounds check that causes Word to read beyond a buffer. Exploitation requires user interaction with attacker-controlled content, and the reported consequence is information disclosure only.
The record
- CVE
- CVE-2026-83951
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-126, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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=19.0.0 <16.0.10417.20207
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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