Code execution via undisclosed use-after-free
Published Jul 14, 2026 · Updated Jul 14, 2026
Use-after-free in Microsoft Office Excel allows attackers to execute code locally after required interaction by an affected user. Microsoft identifies Excel as the affected component but has not disclosed the freed object, stale-reference operation, or input structure that triggers it. Successful exploitation runs code in the affected user's security context.
Summary
What happened
Use-after-free in Microsoft Office Excel allows attackers to execute code locally after required interaction by an affected user. Microsoft identifies Excel as the affected component but has not disclosed the freed object, stale-reference operation, or input structure that triggers it. Successful exploitation runs code in the affected user's security context.
The record
- CVE
- CVE-2026-55948
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-416, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 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 <16.111.26071215
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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