CVE-2026-71260 json
ESPHome web_server Plaintext Password Disclosure via JSON "value" Field
published 2026-08-05 3 mo ago modified 2026-08-26 2 mo ago also EUVD-2026-53345
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
- esphome esphome
Classification
- Weakness
-
- CWE-522 Insufficiently Protected Credentials
References
-
github.com
/esphome/esphome
third-party-advisory
-
github.com
/esphome/esphome/blob/dev/esphome/components/web_server/web_server.cpp
third-party-advisory
Sources
- CVE List CVE-2026-71260
- NVD CVE-2026-71260
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.