CVE-2026-79665

HIGH 8.8

Ech0 before 4.5.1 Authorization Bypass via Session Tokens

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	lin-snow
Product	ech0
Published	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

lin-snow / Ech0

0 < 4.5.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 wooseokdotkim