Remote code execution via use-after-free
Published Aug 3, 2026 · Updated Aug 3, 2026
Use after free in Microsoft Office Excel allows remote attackers to execute code when a user interacts with malicious content. Microsoft has not published the affected parser, object type, or invalid lifetime operation beyond identifying a use-after-free. No privileges are required, but user interaction is required; successful exploitation runs attacker-controlled code in the affected user's Excel context.
Summary
What happened
Use after free in Microsoft Office Excel allows remote attackers to execute code when a user interacts with malicious content. Microsoft has not published the affected parser, object type, or invalid lifetime operation beyond identifying a use-after-free. No privileges are required, but user interaction is required; successful exploitation runs attacker-controlled code in the affected user's Excel context.
The record
- CVE
- CVE-2026-62870
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 3, 2026CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=19.0.0 <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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