What is CVE-2026-64823?

CVE-2026-64823 is a medium-severity vulnerability in Home-assistant Home Assistant Core, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-07-21.

How severe is CVE-2026-64823?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Home-assistant Home Assistant Core

CVE-2026-64823

Home Assistant Core before 2026.5.4 contains a cross-site scripting vulnerability in the Shelly integration's async_get_media_image() method that allows attackers controlling a Shelly device's thumb field to serve arbitrary HTML content by…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Home-assistant Home Assistant Core — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-64823?: CVE-2026-64823 is a medium-severity vulnerability in Home-assistant Home Assistant Core, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-07-21.
How severe is CVE-2026-64823?: Medium severity. CVSS v3 base score is 4.7 out of 10.