Auth bypass in Lin-Snow Ech0
CVE-2026-79665
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/lin-snow/Ech0/security/advisories/GHSA-hmmq-qh6g-6wgh (vendor-advisory)
- www.vulncheck.com/advisories/ech0-before-authorization-bypass-via-session-tokens (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79665?
- CVE-2026-79665 is a high-severity vulnerability in Lin-Snow Ech0, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-08-25.
- How severe is CVE-2026-79665?
- High severity. CVSS v3 base score is 8.8 out of 10.