ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome's web_server authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value. This allows access to web_server functionality (including OTA, if enabled) without knowing any information about the correct username or password. This issue has been patched in version 2025.8.1.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/esphome/esphome/commit/2aceb56606ec8afec5f49c92e140c8050a6ccbe5 Patch
- https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635 Exploit, Vendor Advisory
- https://github.com/esphome/esphome/security/advisories/GHSA-mxh2-ccgj-8635 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.1 · esphomeNVD modified 2026-10-19 17:10
Affected (CPE criteria) 1
cpe:2.3:o:esphome:esphome_firmware:2025.8.0:*:*:*:*:*:*:*