CVE-2026-71250Network attack vector

Authenticated blind SSRF via webhook URL validation

Published Aug 5, 2026 · Updated Aug 5, 2026

SSRF in Firefly III allows remote authenticated users to send blind webhook requests to loopback or internal services. IsValidWebhookUrl explicitly accepts 127.0.0.0/8 and validates one gethostbyname result, while StandardWebhookSender lets Guzzle resolve the host again. Webhooks must be enabled, which is not the default, and response bodies remain in server-side debug logs rather than being returned to the user.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Firefly III allows remote authenticated users to send blind webhook requests to loopback or internal services. IsValidWebhookUrl explicitly accepts 127.0.0.0/8 and validates one gethostbyname result, while StandardWebhookSender lets Guzzle resolve the host again. Webhooks must be enabled, which is not the default, and response bodies remain in server-side debug logs rather than being returned to the user.

The record

CVE
CVE-2026-71250
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Firefly III
Product
Firefly III
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Firefly III · Firefly IIIversion=0

Published CVSS scores

4.3TuranSecCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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