CVE-2026-79667: Improper Authorization in lin-snow Ech0
Description
Ech0 versions 4.3.4 and earlier contain an improper authorization vulnerability where scoped access token restrictions are not reliably enforced on several privileged admin routes. This allows an attacker with a limited-scope admin token to access broader privileged functionality, including reading inbox data and exporting full database backups. The issue is fixed in version 4.4.3.
CVSS v4.0
Score 7.2high
Affected software
lin-snow
Ech0
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Ech0 before version 4.4.3 fails to enforce least-privilege scoped access token restrictions on multiple privileged admin endpoints such as /api/inbox, /api/panel/comments, and /api/backup/export. These endpoints authorize users based solely on admin role presence, ignoring token scope metadata, which is completely discarded by the backup export handler. This flaw enables attackers holding deliberately limited admin tokens to escalate their access to sensitive functions beyond their intended scope. The vulnerability is identified as CVE-2026-79667 with a CVSS 4.0 score of 7.2 (high severity).
Potential Impact
Attackers with low-scope admin access tokens can bypass intended scope restrictions to access sensitive administrative functions, including reading inbox contents and exporting full database backups. This could lead to unauthorized data disclosure and potential compromise of sensitive information stored within the application.
Mitigation Recommendations
Upgrade Ech0 to version 4.4.3 or later, where this improper authorization issue has been fixed. No other mitigation guidance is provided. Patch status is not explicitly stated but the fix version is known, so upgrading to 4.4.3 is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-25T11:10:13.697Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8d820cacd9273b49225414
Added to database: 08/25/2026, 11:52:44 UTC
Last enriched: 09/10/2026, 05:52:16 UTC
Last updated: 10/10/2026, 06:48:19 UTC
Views: 65
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