CVE-2026-79671

Description

Ech0 through 4.2.1 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhook_setting_service.go), which only validates literal IP addresses via net.ParseIP() and fails to reject hostnames that DNS-resolve to private or internal IPs (e.g., 169.254.169.254.nip.io). An attacker with admin privileges can create a webhook with such a hostname to bypass validation and cause the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in 4.4.3.

CVSS Vector

References

• https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69
• https://www.vulncheck.com/advisories/ech0-before-ssrf-via-dns-resolution-bypass