Local information disclosure via uninitialized resources
Published Aug 11, 2026 · Updated Aug 25, 2026
Use of uninitialized resource in Excel in Microsoft Office before the August 2026 updates allows attackers to read memory contents via crafted workbooks. Microsoft has not published the affected Excel parser or code path, only that Excel discloses data after using an uninitialized resource while processing a workbook. On desktops, exploitation requires a local file-open event by the target user; Microsoft also lists Office Online Server as affected, but the public advisory does not disclose which server-side workbook handling path reaches the same flaw.
Summary
What happened
Use of uninitialized resource in Excel in Microsoft Office before the August 2026 updates allows attackers to read memory contents via crafted workbooks. Microsoft has not published the affected Excel parser or code path, only that Excel discloses data after using an uninitialized resource while processing a workbook. On desktops, exploitation requires a local file-open event by the target user; Microsoft also lists Office Online Server as affected, but the public advisory does not disclose which server-side workbook handling path reaches the same flaw.
The record
- CVE
- CVE-2026-68799
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-908
- 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
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What is affected?
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Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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