What’s Vulnerable › Vulnerabilities

CVE-2026-79665: Ech0 before 4.5.1 Authorization Bypass via Session Tokens

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-08-31
• Weakness: CWE-862

Description

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

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/lin-snow/Ech0/security/advisories/GHSA-hmmq-qh6g-6wgh
• https://www.vulncheck.com/advisories/ech0-before-authorization-bypass-via-session-tokens
• https://github.com/lin-snow/Ech0/security/advisories/GHSA-hmmq-qh6g-6wgh

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