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

Quick assessment

Affected
firefly-iii firefly-iii
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Firefly III是Firefly III组织开源的一套个人财务管理系统。 Firefly III存在服务端请求伪造漏洞，该漏洞源于webhook URL验证器对127.0.0.0/8地址段过滤不严且存在DNS重新绑定问题，可能允许经过身份验证的用户配置针对服务器回环服务的webhook，导致盲服务端请求伪造攻击。

CVSS 4.3 · Medium EPSS 0.28% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
firefly-iii firefly-iii affected
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I. Basic Information for CVE-2026-71250

Vulnerability Information
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Vulnerability Title
Firefly III - Webhook URL Validation Explicitly Allows Loopback and Is Bypassable via DNS Rebinding
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Firefly III 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Firefly III是Firefly III组织开源的一套个人财务管理系统。 Firefly III存在服务端请求伪造漏洞，该漏洞源于webhook URL验证器对127.0.0.0/8地址段过滤不严且存在DNS重新绑定问题，可能允许经过身份验证的用户配置针对服务器回环服务的webhook，导致盲服务端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
firefly-iii firefly-iii 0 -

II. Public POCs for CVE-2026-71250

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III. Intelligence Information for CVE-2026-71250

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Vendor Pages for CVE-2026-71250 (1)

IV. Related Vulnerabilities

Same product: firefly-iii
Same vendor: firefly-iii
Same weakness: CWE-918

V. Comments for CVE-2026-71250

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