Out-of-bounds read in Skype for Business Server and Skype for Business Server Subscription Edition - CVE-2026-66308
Published: September 9, 2026
Vulnerability identifier: #VU148356
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66308
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in Skype for Business and Lync. A remote user can trigger an out-of-bounds read error and cause a denial of service condition on the system.
Affected software
Skype for Business Server
Skype for Business Server Subscription Edition
Skype for Business Server Subscription Edition
How to mitigate CVE-2026-66308
Install updates from vendor's website.
Skype for Business Server - addressed in versions 6.0.9319.885, 7.0.2046.569
Skype for Business Server Subscription Edition - update to 7.0.2046.879
Skype for Business Server Subscription Edition - update to 7.0.2046.879