Code execution via stack-based buffer overflow
Published Aug 11, 2026 · Updated Aug 25, 2026
Stack-based buffer overflow in Microsoft Excel allows attackers to execute code locally after a user opens crafted content. Microsoft has not disclosed the affected parser or the bounds error that writes beyond a stack buffer. Exploitation requires user interaction and runs code in the affected user's context; the published record identifies no network attack path.
Summary
What happened
Stack-based buffer overflow in Microsoft Excel allows attackers to execute code locally after a user opens crafted content. Microsoft has not disclosed the affected parser or the bounds error that writes beyond a stack buffer. Exploitation requires user interaction and runs code in the affected user's context; the published record identifies no network attack path.
The record
- CVE
- CVE-2026-68816
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-121, T1203
- 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.112.26081010
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.
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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