CVE-2026-45644: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft Live Share Canvas SDK
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-45644) in Microsoft Live Share Canvas SDK version 1.0.0 is caused by improper neutralization of input during web page generation, classified as CWE-79 (Cross-site Scripting). It enables an authorized attacker to perform privilege escalation over a network. The CVSS 3.1 base score is 8.0, indicating high severity, with attack vector network, low attack complexity, required privileges low, and user interaction required. Microsoft has released an official fix for this vulnerability, as documented in their security update guide.
Potential Impact
Successful exploitation of this vulnerability can lead to high impact on confidentiality, integrity, and availability by allowing an authorized attacker to escalate privileges remotely. This could result in unauthorized actions within the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft Live Share Canvas SDK version 1.0.0 should apply the vendor-provided patch as soon as possible. Refer to the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45644 for detailed remediation instructions.
CVE-2026-45644: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft Live Share Canvas SDK
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.
CVSS v3.1
Score 8.0high
Affected software
pkg:nuget/microsoft.liveshare.canvassdkRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-45644) in Microsoft Live Share Canvas SDK version 1.0.0 is caused by improper neutralization of input during web page generation, classified as CWE-79 (Cross-site Scripting). It enables an authorized attacker to perform privilege escalation over a network. The CVSS 3.1 base score is 8.0, indicating high severity, with attack vector network, low attack complexity, required privileges low, and user interaction required. Microsoft has released an official fix for this vulnerability, as documented in their security update guide.
Potential Impact
Successful exploitation of this vulnerability can lead to high impact on confidentiality, integrity, and availability by allowing an authorized attacker to escalate privileges remotely. This could result in unauthorized actions within the affected environment.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft Live Share Canvas SDK version 1.0.0 should apply the vendor-provided patch as soon as possible. Refer to the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45644 for detailed remediation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T20:33:35.156Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45644","vendor":"Microsoft"}]
Threat ID: 6a284ce98dd33fbd85664ee9
Added to database: 06/09/2026, 17:27:05 UTC
Last enriched: 07/29/2026, 22:02:17 UTC
Last updated: 07/31/2026, 21:26:44 UTC
Views: 62
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