Information disclosure via out-of-bounds read
Published Aug 11, 2026 · Updated Aug 25, 2026
Out-of-bounds read in the Microsoft Office Graphics Component in Microsoft Office allows local users to read unintended memory contents. Microsoft has disclosed only that the Graphics Component reads past a buffer boundary; the affected parser, file format, and code path remain undisclosed in public records. Published scoring indicates user interaction is required and the consequence is bounded to confidentiality exposure, with no published evidence of code execution or service interruption.
Summary
What happened
Out-of-bounds read in the Microsoft Office Graphics Component in Microsoft Office allows local users to read unintended memory contents. Microsoft has disclosed only that the Graphics Component reads past a buffer boundary; the affected parser, file format, and code path remain undisclosed in public records. Published scoring indicates user interaction is required and the consequence is bounded to confidentiality exposure, with no published evidence of code execution or service interruption.
The record
- CVE
- CVE-2026-66809
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Weakness, pattern, technique
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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