Code execution via unsynchronized shared resource
Published Jun 9, 2026 · Updated Jun 9, 2026
Race condition in Microsoft Office Excel allows context-dependent attackers to execute code through local user interaction. Microsoft has disclosed only that Excel concurrently accesses a shared resource without proper synchronization; no file format, parser, or function has been identified. Exploitation requires user interaction and a high-complexity local race, and successful exploitation runs code in the affected user's context.
Summary
What happened
Race condition in Microsoft Office Excel allows context-dependent attackers to execute code through local user interaction. Microsoft has disclosed only that Excel concurrently accesses a shared resource without proper synchronization; no file format, parser, or function has been identified. Exploitation requires user interaction and a high-complexity local race, and successful exploitation runs code in the affected user's context.
The record
- CVE
- CVE-2026-44818
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-362, T1204
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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