ESPHome up to 2026.7.0 web_server web_server.cpp WebServer::text_json_ missing encryption

Summaryinfo

A vulnerability classified as problematic was found in ESPHome up to 2026.7.0. Affected by this vulnerability is the function WebServer::text_json_ of the file esphome/components/web_server/web_server.cpp of the component web_server. The manipulation results in missing encryption. This vulnerability is reported as CVE-2026-71260. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in ESPHome up to 2026.7.0. It has been classified as problematic. Affected is the function WebServer::text_json_ of the file esphome/components/web_server/web_server.cpp of the component web_server. The manipulation with an unknown input leads to a missing encryption vulnerability. CWE is classifying the issue as CWE-311. The product does not encrypt sensitive or critical information before storage or transmission. This is going to have an impact on confidentiality. CVE summarizes:

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(). Because web_server listens on port 80 with no authentication by default, any attacker on the local network can retrieve the plaintext password (e.g. WiFi credentials, API tokens) via GET /text/<entity_id> or the /events EventSource stream.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-71260 since 08/05/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• ESPHome

Version

• 2026.0
• 2026.1
• 2026.2
• 2026.3
• 2026.4
• 2026.5
• 2026.6
• 2026.7.0

CPE 2.3info

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CPE 2.2info

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