CVE-2023-41763
Published 2023-10-10 · Updated 2026-06-17 · Source secure@microsoft.com
Summary
CVE-2023-41763 is a medium-severity (CVSS 5.3) vulnerability in Microsoft Skype for Business. CISA added it to the Known Exploited Vulnerabilities catalog on October 10, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 31, 2023. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →Description
Skype for Business Elevation of Privilege Vulnerability
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA Known-Exploited Vulnerability
Product: Microsoft — Skype for Business
Name: Microsoft Skype for Business Privilege Escalation Vulnerability
Date added: 2023-10-10 · Due: 2023-10-31
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.