{"id":"CVE-2026-64823","summary":"Home Assistant Core \u003c 2026.5.4 XSS via Shelly media_player.py thumb URI","details":"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.","modified":"2026-07-24T03:56:43.744519671Z","published":"2026-07-21T15:16:03.790Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64823.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64823.json"},{"type":"ADVISORY","url":"https://github.com/home-assistant/core/releases/tag/2026.5.4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64823"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/home-assistant-core-xss-via-shelly-media-player-py-thumb-uri"},{"type":"REPORT","url":"https://github.com/home-assistant/core/pull/171585"},{"type":"FIX","url":"https://github.com/home-assistant/core/commit/894a68acb678afc382fe5ea9002e61ab7f862011"},{"type":"PACKAGE","url":"https://github.com/home-assistant/core"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/home-assistant/core","events":[{"introduced":"0"},{"fixed":"0723d8d83ff121e732e76b5dffe1b6648c69d596"},{"fixed":"894a68acb678afc382fe5ea9002e61ab7f862011"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2026.5.4"}]}}],"versions":["2026.5.3","2026.5.2","2026.5.1","2026.5.0","2026.4.4","2026.4.3","2026.4.2","2026.4.1","2026.4.0","2026.3.4","2026.3.3","2026.3.2","2026.3.1","2026.3.0","2026.2.3","2026.2.2","2026.2.1","2026.2.0","2026.1.3","2026.1.2","2026.1.1","2026.1.0","2025.12.5","2025.12.4","2025.12.3","2025.12.2","2025.12.1","2025.12.0","2025.11.3","2025.11.2","2025.11.1","2025.11.0","2025.10.4","2025.10.3","2025.10.2","2025.10.1","2025.10.0","2025.9.4","2025.9.3","2025.9.2","2025.9.1","2025.9.0","2025.8.3","2025.8.2","2025.8.1","2025.8.0","2025.7.4","2025.7.3","2025.7.2","2025.7.1","2025.7.0","2025.6.3","2025.6.2","2025.6.1","2025.6.0","2025.5.3","2025.5.2","2025.5.1","2025.5.0","2025.4.4","2025.4.3","2025.4.2","2025.4.1","2025.4.0","2025.3.4","2025.3.3","2025.3.2","2025.3.1","2025.3.0","2025.2.5","2025.2.4","2025.2.3","2025.2.2","2025.2.1","2025.2.0","2025.1.4","2025.1.3","2025.1.2","2025.1.1","2025.1.0","2024.12.5","2024.12.4","2024.12.3","2024.12.2","2024.12.1","2024.12.0","2024.11.3","2024.11.2","2024.11.1","2024.11.0","2024.10.3","2024.10.2","2024.10.1","2024.10.0","2024.9.3","2024.9.2","2024.9.1","2024.9.0","2024.8.3","2024.8.2","2024.8.1","2024.8.0","2024.7.4","2024.7.3","2024.7.2","2024.7.1","2024.7.0","2024.6.4","2024.6.3","2024.6.2","2024.6.1","2024.6.0","2024.5.5","2024.5.4","2024.5.3","2024.5.2","2024.5.1","2024.5.0","2024.4.4","2024.4.3","2024.4.2","2024.4.1","2024.4.0","2024.3.3","2024.3.2","2024.3.1","2024.3.0","2024.2.5","2024.2.4","2024.2.3","2024.2.2","2024.2.1","2024.2.0","2024.1.6","2024.1.5","2024.1.4","2024.1.3","2024.1.2","2024.1.1","2024.1.0","2023.12.4","2023.12.3","2023.12.2","2023.12.1","2023.12.0","2023.11.3","2023.11.2","2023.11.1","2023.11.0","2023.10.5","2023.10.4","2023.10.3","2023.10.2","2023.10.1","2023.10.0","2023.9.3","2023.9.2","2023.9.1","2023.9.0","2023.8.4","2023.8.3","2023.8.2","2023.8.1","2023.8.0","2023.7.3","2023.7.2","2023.7.1","2023.7.0","2023.6.3","2023.6.2","2023.6.1","2023.6.0","2023.5.4","2023.5.3","2023.5.2","2023.5.1","2023.5.0","2023.4.6","2023.4.5","2023.4.4","2023.4.3","2023.4.2","2023.4.1","2023.4.0","2023.3.6","2023.3.5","2023.3.4","2023.3.3","2023.3.2","2023.3.1","2023.3.0","2023.2.5","2023.2.4","2023.2.3","2023.2.2","2023.2.1","2023.2.0","2023.1.7","2023.1.6","2023.1.5","2023.1.4","2023.1.3","2023.1.2","2023.1.1","2023.1.0","2022.12.9","2022.12.8","2022.12.7","2022.12.6","2022.12.5","2022.12.4","2022.12.3","2022.12.2","2022.12.1","2022.12.0","2022.11.5","2022.11.4","2022.11.3","2022.11.2","2022.11.1","2022.11.0","2022.10.5","2022.10.4","2022.10.3","2022.10.2","2022.10.1","2022.10.0","2022.9.7","2022.9.6","2022.9.5","2022.9.4","2022.9.3","2022.9.2","2022.9.1","2022.9.0","2022.8.7","2022.8.6","2022.8.5","2022.8.4","2022.8.3","2022.8.2","2022.8.1","2022.8.0","2022.7.7","2022.7.6","2022.7.5","2022.7.4","2022.7.3","2022.7.2","2022.7.1","2022.7.0","2022.6.7","2022.6.6","2022.6.5","2022.6.4","2022.6.3","2022.6.2","2022.6.1","2022.6.0","2022.5.5","2022.5.4","2022.5.3","2022.5.2","2022.5.1","2022.5.0","2022.4.7","2022.4.6","2022.4.5","2022.4.4","2022.4.3","2022.4.2","2022.4.1","2022.4.0","2022.3.8","2022.3.7","2022.3.6","2022.3.5","2022.3.4","2022.3.3","2022.3.2","2022.3.1","2022.3.0","2022.2.9","2022.2.8","2022.2.7","2022.2.6","2022.2.5","2022.2.4","2022.2.3","2022.2.2","2022.2.1","2022.2.0","2021.12.10","2021.12.9","2021.12.8","2021.12.7","2021.12.6","2021.12.5","2021.12.4","2021.12.3","2021.12.2","2021.12.1","2021.12.0","2021.11.5","2021.11.4","2021.11.3","2021.11.2","2021.11.1","2021.11.0","2021.10.7","2021.10.6","2021.10.5","2021.10.4","2021.10.3","2021.10.2","2021.10.1","2021.10.0","2021.9.7","2021.9.6","2021.9.5","2021.9.4","2021.9.3","2021.9.2","2021.9.1","2021.9.0","2021.8.8","2021.8.7","2021.8.6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