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CVE-2026-64823

Home Assistant Core < 2026.5.4 XSS via Shelly media_player.py thumb URI

Published: Jul 21, 2026Updated: Jul 22, 2026 Sources: CVE List NVDCWE-79
4.7MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 92.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

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 supplying a data URI with a text/html content type without validation against an image-only allowlist. Attackers can cause the media player proxy endpoint to serve attacker-controlled bytes with Content-Type text/html in the Home Assistant web origin, enabling theft of session tokens from local storage and authenticated calls to sensitive service endpoints including lock, alarm, and cover controls.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

home-assistant
oss-projectaka home-assistant.io, homeassistant, home assistant
Home Assistant CoreOn-prem
ICS / OT / IoT / smart-home

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/home-assistant/core/releases/tag/2026.5.4
github.com
https://github.com/home-assistant/core/pull/171585
github.com
https://github.com/home-assistant/core/commit/894a68acb678afc382fe5ea9002e61ab7f862011
github.com
and 1 more references View all →

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