CVE-2026-66302: Skype for Business Remote Code Execution Vulnerability
Published Sep 8, 2026
·Updated
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
Other sources
Skype for Business Remote Code Execution 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 2019 CU8<7.0.2046.569
7.0.2046.569
Microsoft Skype for Business Server Subscription Edition CU1<7.0.2046.879
7.0.2046.879
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
Which deployments are identified as affected?
The affected products listed are Microsoft Skype for Business Server 2015 CU13, Skype for Business Server 2019 CU8, and Skype for Business Server Subscription Edition CU1.
2
Does exploitation require credentials or user interaction?
No. The CVSS vector indicates network-based exploitation with low attack complexity, no privileges required, and no user interaction required.
3
What is the potential security impact if exploitation succeeds?
The vulnerability is rated critical with a CVSS score of 9.8 and has high confidentiality, integrity, and availability impacts.