{"id":"CVE-2026-71250","state":"PUBLISHED","title":"Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding","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.","publishedAt":"2026-08-05T10:57:08.628Z","updatedAt":"2026-08-10T11:46:07.818Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","source":"TuranSec"},"assigner":"TuranSec","products":["firefly-iii firefly-iii"],"affected":[{"vendor":"firefly-iii","product":"firefly-iii","defaultStatus":"unknown","versions":[{"version":"0","status":"affected"}],"programFiles":["app/Rules/Webhook/IsValidWebhookUrl.php","app/Support/Webhook/StandardWebhookSender.php"]}],"references":["https://github.com/firefly-iii/firefly-iii"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71250.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71250","state":"PUBLISHED","datePublished":"2026-08-05T10:57:08.628Z","dateUpdated":"2026-08-10T11:46:07.818Z","assignerShortName":"TuranSec","assignerOrgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","dateReserved":"2026-08-05T10:53:53.177Z"},"containers":{"cna":{"title":"Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding","descriptions":[{"lang":"en","value":"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":[{"vendor":"firefly-iii","product":"firefly-iii","defaultStatus":"unknown","versions":[{"version":"0","status":"affected"}],"programFiles":["app/Rules/Webhook/IsValidWebhookUrl.php","app/Support/Webhook/StandardWebhookSender.php"]}],"references":[{"url":"https://github.com/firefly-iii/firefly-iii","tags":["third-party-advisory"]}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","baseScore":4.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918 Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"TuranSec","orgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","dateUpdated":"2026-08-10T11:46:07.818Z"},"credits":[{"lang":"en","value":"Bobur Abdugafforov","type":"finder"}],"source":{"discovery":"EXTERNAL"},"datePublic":"2026-08-05T10:57:08.628Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-05T12:41:17.824255Z","id":"CVE-2026-71250","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-05T12:41:26.060Z"}}]}}}