CVE-2026-79667
Received Received - Intake

Elevated Privilege Bypass in Ech0 via Missing Scope Checks

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: VulnCheck

Description
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.

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Meta Information

Published
2026-08-25
Last Modified
2026-08-25
Generated
2026-08-25
AI Q&A
2026-08-25
EPSS Evaluated
N/A
NVD
CVE-2026-79667
EUVD
EUVD-2026-65447

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
ech0 version to 4.4.3 (exc)
lin-snow ech0 to 4.4.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-285 The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

Ech0 versions 4.3.4 and earlier fail to enforce least-privilege access token restrictions on privileged admin routes. Multiple endpoints like /api/inbox and /api/backup/export omit scope checks, allowing low-scope admin tokens to access broader functionality. The backup export handler discards token scope metadata entirely, enabling unauthorized data exfiltration.

Detection Guidance

Check Ech0 admin endpoints for unauthorized access attempts. Monitor logs for requests to /api/inbox, /api/panel/comments, or /api/backup/export with low-scope admin tokens. Verify scope enforcement is missing on privileged routes.

Impact Analysis

An attacker with a limited admin access token could read sensitive inbox data, access privileged admin panels, or export a full database backup ZIP archive containing logs and files. This could lead to unauthorized data access, exfiltration, or system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Non-compliance risks include legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Upgrade Ech0 to version 4.4.3 or later. Apply scope enforcement to all privileged routes. Ensure backup export functionality is behind authenticated router groups and preserves token metadata.

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