What is CVE-2026-45644?

CVE-2026-45644 is a high-severity vulnerability in Microsoft Live_share_canvas, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-06-09.

How severe is CVE-2026-45644?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Microsoft Live_share_canvas

CVE-2026-45644

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.006 (42.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft Live_share_canvas
Microsoft Live Share Canvas Sdk — versions 1.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-45644?: CVE-2026-45644 is a high-severity vulnerability in Microsoft Live_share_canvas, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-06-09.
How severe is CVE-2026-45644?: High severity. CVSS v3 base score is 8.0 out of 10.