Sensitive information disclosure via error messages
Published Sep 8, 2026 · Updated Sep 9, 2026
Error-message information disclosure in Microsoft Skype for Business Server allows remote attackers to read sensitive data over a network. The server includes sensitive information in an error response, but Microsoft has not identified the request path, component, or exposed data. Exploitation requires user interaction but no prior privileges; the reported consequence is disclosure only, without modification or interruption.
Summary
What happened
Error-message information disclosure in Microsoft Skype for Business Server allows remote attackers to read sensitive data over a network. The server includes sensitive information in an error response, but Microsoft has not identified the request path, component, or exposed data. Exploitation requires user interaction but no prior privileges; the reported consequence is disclosure only, without modification or interruption.
The record
- CVE
- CVE-2026-66306
- Published
- Sep 8, 2026
- Updated
- Sep 9, 2026
- Vendor
- Microsoft
- Product
- Skype for Business Server Subscription Edition
- Classifications
- CWE-209
- 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=2046.0 <7.0.2046.879
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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