CVE-2026-71260

ESPHome web_server Plaintext Password Disclosure via JSON "value" Field

State: Published
Severity: 6.5 Medium
Published: Aug 5, 2026
Updated: Aug 10, 2026
Reserved: Aug 5, 2026

Description

ESPHome through 2026.7.0-dev discloses plaintext passwords via its web_server component. In WebServer::text_json_ (esphome/components/web_server/web_server.cpp), a text entity configured with mode: password (TEXT_MODE_PASSWORD) has its JSON "state" field correctly masked as "********", but the same serialization path unconditionally writes the raw password into the JSON "value" field via set_json_icon_state_value/set_json_value.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	TuranSec

Weaknesses

CWE-522

Affected Products

Product	Versions
esphomeesphome	2026.7.0 and earlierAffected

References

https://github.com/esphome/esphomethird-party-advisory
https://github.com/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cppthird-party-advisory

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