Information disclosure via out-of-bounds read
Published Sep 8, 2026 · Updated Sep 10, 2026
Out-of-bounds read in Microsoft Office allows remote attackers to disclose information over a network after user interaction. Microsoft has not published the affected parser, file format, or the operation that reads beyond its allocated buffer. Exploitation requires a user to interact with attacker-supplied content and exposes memory contents without reported integrity or availability impact.
Summary
What happened
Out-of-bounds read in Microsoft Office allows remote attackers to disclose information over a network after user interaction. Microsoft has not published the affected parser, file format, or the operation that reads beyond its allocated buffer. Exploitation requires a user to interact with attacker-supplied content and exposes memory contents without reported integrity or availability impact.
The record
- CVE
- CVE-2026-80089
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-125
- 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.
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Technologies
Your stack
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Your stack
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