Cross-Site Scripting Vulnerability in Skype for Business by Microsoft
CVE-2026-63523

6.5MEDIUM

Key Information:

Vendor

Microsoft
Status
Skype For Business Server 2015 Cu13
Skype For Business Server 2019 Cu8
Skype For Business Server Subscription Edition Cu1
Vendor
CVE Published:
8 September 2026

What is CVE-2026-63523?

A cross-site scripting vulnerability in Skype for Business enables unauthorized attackers to manipulate web page content, potentially leading to spoofing attacks. By exploiting this flaw, attackers can inject malicious scripts that would execute in the context of the victim's session, compromising security and user data. Users of Skype for Business are advised to update their systems to mitigate this risk. For more information and available patches, please refer to the official advisory.

Affected Version(s)

Skype for Business Server 2015 CU13 x64-based Systems 9319.0 < 6.0.9319.885

Skype for Business Server 2019 CU8 x64-based Systems 2046.0 < 7.0.2046.569

Skype for Business Server Subscription Edition CU1 x64-based Systems 2046.0 < 7.0.2046.879

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.