Information disclosure via out-of-bounds read
Published Sep 12, 2023 · Updated Oct 30, 2025
An out-of-bounds read in Microsoft Excel and Office products allows local users to disclose information after user interaction. Microsoft has not published the affected parser or the memory operation that reads beyond its intended boundary. Exploitation requires a user to process attacker-controlled content, and the public record does not identify the exposed data.
Summary
What happened
An out-of-bounds read in Microsoft Excel and Office products allows local users to disclose information after user interaction. Microsoft has not published the affected parser or the memory operation that reads beyond its intended boundary. Exploitation requires a user to process attacker-controlled content, and the public record does not identify the exposed data.
The record
- CVE
- CVE-2023-36766
- Published
- Sep 12, 2023
- Updated
- Oct 30, 2025
- Vendor
- Microsoft
- Product
- Microsoft Office 2019
- Classifications
- CWE-125, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 12, 2023CVE publishedPublication date reported by the CVE source.
- Oct 30, 2025Record 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.
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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