CVE-2026-64823
Last modified
CVE-2026-64823 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| home-assistant | Home Assistant Core | < 2026.5.4 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-64823?
How severe is CVE-2026-64823?
How do I fix CVE-2026-64823?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-64814In JetBrains IntelliJ IDEA before 2026.2 unauthorized file a…8.6
- CVE-2026-64815In JetBrains IntelliJ IDEA before 2026.2 arbitrary code inje…9.8
- CVE-2026-64816RapidRAW before 1.6.0 does not validate the lutPath field in…7.1
- CVE-2026-6482The Rapid7 Insight Agent (versions > 4.1.0.2) is vulnerable …7.8
- CVE-2026-64821djangoSIGE through 1.10 (commit a6fe7e8) contains a cross-si…5.3
- CVE-2026-64822djangoSIGE through 1.10 (commit a6fe7e8) contains a user enu…6.9
- CVE-2026-64824Home Assistant Core before 2026.7.0 contains a path traversa…9.3
- CVE-2026-64825Home Assistant Core before 2026.6.0 contains a path traversa…9.3
- CVE-2026-64827Telenia Software TVox 26.5.3 and prior 26.x versions, and 24…9.8
- CVE-2026-64828Froiden TableTrack through 1.3.10 contains a stored cross-si…6.1
- CVE-2026-64829Question2Answer through 1.8.8 contains a session invalidatio…9.1
- CVE-2026-6483A vulnerability was found in Wavlink WL-WN530H4 20220721. Th…7.3
Are you affected by CVE-2026-64823?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST