CVE-2026-79667: Lin-Snow ECH0

High severity, CVSS 7.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Ech0 version 4.3.4 and earlier fails to reliably enforce scoped access token (least-privilege) restrictions on several privileged admin routes. Multiple privileged endpoints (e.g., /api/inbox, /api/panel/comments, /api/backup/export) omit scope checks and authorize based only on the user's admin role, and the backup export handler discards token scope metadata entirely. An attacker holding a deliberately limited (low-scope) admin access token can reach broader privileged functionality than intended, including reading the inbox and exporting a full database backup ZIP archive. Fixed in 4.4.3.

Affected products

• Lin-Snow ECH0: before 4.4.3 (fixed in 4.4.3)

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