CVE-2026-79665: Lin-Snow ECH0

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Ech0 before 4.5.1 contains an authorization bypass vulnerability where session tokens skip scope validation in RequireScopes middleware, allowing logged-in non-admin users to access admin endpoints. Attackers can read system logs, visitor statistics, user emails, and subscribe to live WebSocket logs by sending authenticated session tokens to unprotected endpoints.

Affected products

• Lin-Snow ECH0: before 4.5.1 (fixed in 4.5.1)

Published 2026-08-25. Last modified 2026-08-31.