CVE-2026-79671: Server-Side Request Forgery (SSRF) in lin-snow Ech0
Description
Ech0 versions before 4.4.3 have a server-side request forgery (SSRF) vulnerability in the validateWebhookURL function. The function improperly validates webhook URLs by only checking literal IP addresses and failing to reject hostnames that resolve to private or internal IP addresses. An attacker with admin privileges can exploit this to create webhooks that cause the server to make unauthorized requests to internal services or cloud metadata endpoints. This vulnerability is fixed in version 4.4.3.
CVSS v4.0
Score 5.1medium
Affected software
lin-snow
Ech0
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-79671 is an SSRF vulnerability in lin-snow Ech0 prior to version 4.4.3. The validateWebhookURL function in webhook_setting_service.go uses net.ParseIP() to validate webhook URLs but only checks for literal IP addresses. It does not reject hostnames that resolve via DNS to private or internal IP addresses (e.g., 169.254.169.254.nip.io). An attacker with administrative privileges can exploit this by creating a webhook with such a hostname, bypassing validation and causing the server to send requests to internal network resources, including cloud metadata endpoints. This issue is resolved in Ech0 version 4.4.3.
Potential Impact
An attacker with admin privileges can exploit this vulnerability to make the server perform unauthorized requests to internal services and cloud metadata endpoints. This could lead to information disclosure or further internal network compromise. The CVSS 4.0 base score is 5.1 (medium severity), reflecting the need for administrative privileges and limited impact scope.
Mitigation Recommendations
Upgrade Ech0 to version 4.4.3 or later, where this SSRF vulnerability is fixed. No other mitigation is required as the issue is resolved in the official patch.
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: 6a8d820eacd9273b49225448
Added to database: 08/25/2026, 11:52:46 UTC
Last enriched: 09/10/2026, 19:35:12 UTC
Last updated: 10/09/2026, 18:48:23 UTC
Views: 84
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