What is CVE-2026-71250?

CVE-2026-71250 is a medium-severity vulnerability in Firefly-Iii, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-08-05.

How severe is CVE-2026-71250?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Firefly-Iii

CVE-2026-71250

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.002 (12.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Firefly-iii — versions 0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)

Frequently asked questions

What is CVE-2026-71250?: CVE-2026-71250 is a medium-severity vulnerability in Firefly-Iii, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2026-08-05.
How severe is CVE-2026-71250?: Medium severity. CVSS v3 base score is 4.3 out of 10.