Auth bypass in Lin-Snow Ech0
CVE-2026-79666
Ech0 before 4.4.3 fails to enforce administrator authorization on dashboard log endpoints, allowing any authenticated user to access system logs. Attackers with valid user sessions can query GET /api/system/logs and subscribe to SSE and WebSocket log streams to retrieve sensitive operational data including file paths, stack traces, and internal URLs.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/lin-snow/Ech0/security/advisories/GHSA-cp79-9mwr-wr49 (vendor-advisory)
- www.vulncheck.com/advisories/ech0-before-missing-authorization-via-dashboard-lo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79666?
- CVE-2026-79666 is a medium-severity vulnerability in Lin-Snow Ech0, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-25.
- How severe is CVE-2026-79666?
- Medium severity. CVSS v3 base score is 6.5 out of 10.