CVE-2026-66306: Skype for Business Information Disclosure Vulnerability
Published Sep 8, 2026
·Updated
Generation of error message containing sensitive information in Skype for Business allows an unauthorized attacker to disclose information over a network.
Other sources
Skype for Business Information Disclosure Vulnerability
— Microsoft
Affected Software
9 affected componentsFixes available
Microsoft Skype for Business Server 2015 CU13<6.0.9319.885
6.0.9319.885
Microsoft Skype for Business Server Subscription Edition CU1<7.0.2046.879
7.0.2046.879
Microsoft Skype for Business Server 2019 CU8<7.0.2046.569
7.0.2046.569
Microsoft Skype for Business Server=2015-cumulative_update_13
Microsoft Skype for Business Server=2015-cumulative_update_13_hotfix_2
Microsoft Skype for Business Server=2019-cumulative_update_8
Microsoft Skype for Business Server=2019-cumulative_update_8_hotfix1
Microsoft Skype for Business Server=2019-cumulative_update_8_hotfix2
Microsoft Skype For Business Server Subscription Edition=7.0.2046.849
Remediation
Event History
Sep 8, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·06:30 PM
Data Sourced
via MITRE·06:30 PM
DescriptionSeverity
Data Sourced
via NVD·07:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
The vector is network-based and no privileges are required. Exploitation requires user interaction.
2
What is the expected impact if the vulnerability is exploited?
An unauthorized attacker may disclose sensitive information. The provided severity data indicates confidentiality impact is high, with no stated integrity or availability impact.
3
Which deployments are identified as affected?
The affected software listed is Microsoft Skype for Business Server 2015 CU13, Skype for Business Server Subscription Edition CU1, and Skype for Business Server 2019 CU8.