Information disclosure via uninitialized resource use
Published Sep 8, 2026 · Updated Sep 10, 2026
Information disclosure in Microsoft Office allows remote attackers to read uninitialized data over a network after user interaction. Microsoft identifies the defect only as use of an uninitialized resource and has not disclosed the affected component or operation that exposes residual data. Successful exploitation requires user interaction and provides confidentiality impact only, with no reported data modification or service interruption.
Summary
What happened
Information disclosure in Microsoft Office allows remote attackers to read uninitialized data over a network after user interaction. Microsoft identifies the defect only as use of an uninitialized resource and has not disclosed the affected component or operation that exposes residual data. Successful exploitation requires user interaction and provides confidentiality impact only, with no reported data modification or service interruption.
The record
- CVE
- CVE-2026-80091
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-908
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 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=16.0.0 <16.112.26083020
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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