Credential disclosure enabling network spoofing
Published Sep 8, 2026 · Updated Sep 9, 2026
Credential exposure in Microsoft Office allows remote attackers to perform network spoofing without authentication after user interaction. Microsoft has not disclosed which Office component mishandles credentials or the operation that exposes them to attackers. The flaw can disclose credential material, while published impact data reports no ability to modify data or interrupt service.
Summary
What happened
Credential exposure in Microsoft Office allows remote attackers to perform network spoofing without authentication after user interaction. Microsoft has not disclosed which Office component mishandles credentials or the operation that exposes them to attackers. The flaw can disclose credential material, while published impact data reports no ability to modify data or interrupt service.
The record
- CVE
- CVE-2026-64918
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office 2016
- Classifications
- CWE-522
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 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 <16.0.5569.1003
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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