Description
Firefly III's webhook URL validator (IsValidWebhookUrl.php) filters most private/reserved IPv4 ranges but contains an explicit early-return that allows any resolved address in 127.0.0.0/8, permitting an authenticated user (with webhooks enabled, which is off by default) to configure a webhook targeting loopback services on the server.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| firefly-iii | firefly-iii | — | — |
References
- https://github.com/firefly-iii/firefly-iii third-party-advisory