{"id":"CVE-2026-71250","published":"2026-08-05T11:16:28.110","lastModified":"2026-08-10T12:17:27.630","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.","cvssScore":4.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-918"],"vendors":[],"products":[],"references":[{"url":"https://github.com/firefly-iii/firefly-iii","tags":[]}],"exploitRefs":[{"url":"https://github.com/firefly-iii/firefly-iii","tags":[]}],"hasPoc":true,"ai":null}