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PatchSiren cyber security CVE debrief

CVE-2026-45644 Microsoft CVE debrief

CVE-2026-45644 is a HIGH severity vulnerability in Microsoft Live Share Canvas SDK with a CVSS score of 8. The vulnerability is caused by improper neutralization of input during web page generation, allowing an authorized attacker to elevate privileges over a network. The vulnerability was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-45644) and last modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-45644).

Vendor
Microsoft
Product
Microsoft Live Share Canvas SDK
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-19
Advisory published
2026-06-09
Advisory updated
2026-06-19

Who should care

Users of Microsoft Live Share Canvas SDK should apply patches or mitigations to prevent exploitation of this vulnerability.

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Live Share Canvas SDK. This allows an authorized attacker to elevate privileges over a network.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or mitigations provided by Microsoft to prevent exploitation of this vulnerability.
  • Review and update configurations to ensure proper neutralization of input during web page generation.

Evidence notes

The vendor of this product is likely Microsoft, as indicated by the evidence in the vendor section.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45644 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45644

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45644 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45644

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.