Local code execution via use-after-free
Published Apr 8, 2025 · Updated Aug 10, 2026
Use-after-free in Excel in Microsoft 365 Apps for Enterprise allows local users to execute code after opening malicious content. Microsoft has not disclosed the affected Excel component, the object freed too early, or the operation that later reuses its memory. Exploitation requires user interaction and executes code within the affected user's security context, permitting access to that user's data and privileges.
Summary
What happened
Use-after-free in Excel in Microsoft 365 Apps for Enterprise allows local users to execute code after opening malicious content. Microsoft has not disclosed the affected Excel component, the object freed too early, or the operation that later reuses its memory. Exploitation requires user interaction and executes code within the affected user's security context, permitting access to that user's data and privileges.
The record
- CVE
- CVE-2025-29823
- Published
- Apr 8, 2025
- Updated
- Aug 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft 365 Apps for enterprise
- Classifications
- CWE-416, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2025CVE publishedPublication date reported by the CVE source.
- Aug 10, 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=16.0.1 <https://aka.ms/OfficeSecurityReleases
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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