{"id":"CVE-2026-71250","summary":"Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding","details":"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.","modified":"2026-10-08T02:51:54.790978764Z","published":"2026-08-05T10:57:08.628Z","database_specific":{"cna_assigner":"TuranSec","cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71250.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71250.json"},{"type":"ADVISORY","url":"https://github.com/firefly-iii/firefly-iii"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71250"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/firefly-iii/firefly-iii","events":[{"introduced":"0"},{"last_affected":"0"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"0"}]}}],"versions":["0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-71250.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}