CVE-2026-71250
Medium
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.
SeverityMedium
CVSS4.3
Exploit probability—
ProductFirefly-iii
PublishedAug 5, 2026
First seenAug 5, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| firefly-iii firefly-iii | 0 | — |
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