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CVE-2026-45644— Microsoft Live Share Canvas SDK Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Microsoft Live Share Canvas SDK
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Live Share Canvas SDK是美国微软（Microsoft）公司的一个可选扩展组件，专门用于帮助开发者在 Microsoft Teams 会议应用中轻松添加实时的、多人协作的数字白板（或涂鸦画布）。 Microsoft Live Share Canvas SDK存在跨站脚本漏洞。攻击者利用该漏洞执行跨站脚本攻击。

CVSS 8.0 · High EPSS 0.81% · P56

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Live Share Canvas SDK 1.0.0< 1.4.2 affected
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I. Basic Information for CVE-2026-45644

Vulnerability Information
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Vulnerability Title
Microsoft Live Share Canvas SDK Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Live Share Canvas SDK allows an authorized attacker to elevate privileges over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Live Share Canvas SDK 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Live Share Canvas SDK是美国微软（Microsoft）公司的一个可选扩展组件，专门用于帮助开发者在 Microsoft Teams 会议应用中轻松添加实时的、多人协作的数字白板（或涂鸦画布）。 Microsoft Live Share Canvas SDK存在跨站脚本漏洞。攻击者利用该漏洞执行跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Live Share Canvas SDK 1.0.0 ~ 1.4.2 -

II. Public POCs for CVE-2026-45644

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III. Intelligence Information for CVE-2026-45644

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Vendor Advisories for CVE-2026-45644 (1)

Same Patch Batch · Microsoft · 2026-06-09 · 200 CVEs total

CVE-2026-45657 9.8 CRITICAL Windows Kernel Remote Code Execution Vulnerability
CVE-2026-47643 9.8 CRITICAL Azure Stack Edge Remote Code Execution Vulnerability
CVE-2026-47291 9.8 CRITICAL HTTP.sys Remote Code Execution Vulnerability
CVE-2026-26142 9.8 CRITICAL Nuance PowerScribe Remote Code Execution Vulnerability
CVE-2026-44815 9.8 CRITICAL DHCP Client Service Remote Code Execution Vulnerability
CVE-2026-47281 9.6 CRITICAL Visual Studio Code Elevation of Privilege Vulnerability
CVE-2026-42904 9.6 CRITICAL Windows TCP/IP Elevation of Privilege Vulnerability
CVE-2026-45602 9.1 CRITICAL Windows Dynamic Host Configuration Protocol (DHCP) Tampering Vulnerability
CVE-2026-47653 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-45648 8.8 HIGH Windows Active Directory Domain Services Remote Code Execution Vulnerability
CVE-2026-45504 8.8 HIGH Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-47289 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-32193 8.8 HIGH Azure Kubernetes Service (AKS) Remote Code Execution Vulnerability
CVE-2026-45484 8.8 HIGH Microsoft SharePoint Elevation of Privilege Vulnerability
CVE-2026-42985 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-40371 8.8 HIGH Microsoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability
CVE-2026-45463 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45641 8.4 HIGH Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-45482 8.4 HIGH Microsoft Visual Studio Code CoPilot Chat Security Feature Bypass Vulnerability
CVE-2026-45472 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability

Showing top 20 of 200 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Microsoft
Same weakness: CWE-79

V. Comments for CVE-2026-45644

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