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CVE-2026-76838 - Hi.Events before 1.11.1-beta Server-Side Request Forgery via Unvalidated Webhook Redirects

CVE ID : CVE-2026-76838 Published : Aug. 24, 2026, 6:17 p. m. • 54 minutes ago Description : Hi. Events validates a webhook destination only when it is registered, never when it is used. NoInternalUrlRule in backend/app/Validators/Rules/NoInternalUrlRule. php resolves the hostname with gethostbyname() and rejects private and reserved ranges, which any public hostname passes. At dispatch, WebhookDispatchService takes the stored URL and calls it through spatie/laravel-webhook-server without repeating the check, and backend/config/webhook-server. php sets no Guzzle options, so redirect following remains enabled by default. A destination that answers with a redirect to a loopback, private or cloud metadata address therefore causes the server to issue that request, and changing the hostname's DNS record after registration reaches the same result because no resolution is repeated.

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