CVE-2026-71260 ESPHome web_server Plaintext Password Disclosure via JSON "value" Field
Attackers can retrieve plaintext passwords from ESPHome web server JSON responses due to improper masking of the value field.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71260?
CVE-2026-71260 is a medium-severity vulnerability in esphome, published on 5 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-522
Which versions are affected by CVE-2026-71260?
How do I fix CVE-2026-71260?
No fix has been published for CVE-2026-71260 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-71260 being exploited?
There is no known exploitation of CVE-2026-71260 in the wild and no public exploit code.
Sources
Also known as GHSA-qmjj-2rwx-5ffc.