CVE-2026-71250 — Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding

CVE-2026-71250

Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
firefly-iii / firefly-iii	affected 0

CWE

CWE-918

References

https://github.com/firefly-iii/firefly-iii

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.