GHSA-r2x7-427f-rq69
Medium · 5.5Ech0 has SSRF via DNS Resolution Bypass in Webhook URL Validation
CVSS
5.5
EPSS
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Published
Apr 10, 2026
CISA due date
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The record
The `validateWebhookURL` function in `webhook_setting_service.go` attempts to block webhooks targeting private/internal IP addresses, but only checks literal IP strings via `net.ParseIP()`. Hostnames that DNS-resolve to private IPs (e.g., `169.254.169.254.nip.io`, `10.0.0.1.nip.io`) bypass all checks, allowing an admin to create webhooks that make server-side requests to internal network services and cloud metadata endpoints.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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