CVE-2026-59178 ESPHome Device Builder Dashboard - Authentication Bypass

ESPHome Device Builder Dashboard prior to 1.0.12 contains an authentication bypass caused by removal of fallback environment variables for credentials, letting unauthenticated attackers access the dashboard remotely, exploit requires exposed dashboard port.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.78% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-306

Vendor fix

Upgrade to version 1.0.12 or later; alternatively, set new environment variables $ESPHOME_USERNAME and $ESPHOME_PASSWORD to restore authentication.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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