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    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.

    Published:Aug 5, 2026
    Last Modified:Aug 10, 2026
    EPS:Aug 5, 2026
    EPSS Score:0.00217
    CVSS Score:4.3

    Affected Products

    Vendor
    Firefly-iii
    Product
    Firefly Iii

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2024-37893 (CVSS 5.9) — Firefly III is a free and open source personal finance manager. In affected versions an MFA bypass in the Fire…
    CVE-2024-22075 (CVSS 6.1) — Firefly III (aka firefly-iii) before 6.1.1 allows webhooks HTML Injection.…
    CVE-2023-1788 (CVSS 9.8) — Insufficient Session Expiration in GitHub repository firefly-iii/firefly-iii prior to 6.…
    CVE-2023-1789 (CVSS 9.8) — Improper Input Validation in GitHub repository firefly-iii/firefly-iii prior to 6.0.0.…
    CVE-2023-0298 (CVSS 6.5) — Incorrect Authorization in GitHub repository firefly-iii/firefly-iii prior to 5.8.0.…
    CVE-2021-4005 (CVSS 4.3) — firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)…
    CVE-2021-4015 (CVSS 4.3) — firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)…
    CVE-2021-3921 (CVSS 4.3) — firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)…
    CVE-2021-3901 (CVSS 8.8) — firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)…
    CVE-2021-3900 (CVSS 6.5) — firefly-iii is vulnerable to Cross-Site Request Forgery (CSRF)…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High