CVE-2026-43924— FOSSBilling has an open redirect via administrator-configured redirect targets

FOSSBilling has an open redirect via administrator-configured redirect targets

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the Redirect module does not validate the URL scheme of administrator-configured destination URLs before storing or issuing redirects. This allows arbitrary external URLs to be configured as redirect targets, creating an open redirect vulnerability exploitable for phishing attacks. Users following a legitimate FOSSBilling URL can be silently redirected to an attacker-controlled external site. The redirect is issued as a 301 (Moved Permanently) response, which browsers cache persistently, amplifying the impact. Exploitation requires administrator privileges to create or modify redirect entries, limiting practical attack scenarios to multi-admin environments or compromised admin accounts. Version 0.8.0 fixes the issue. Some workarounds are available. Restrict admin access to the Redirect module to trusted administrators only and/or audit existing redirect entries in the database (the `extension_meta` table with `extension = 'mod_redirect'`) for any unexpected or external target URLs.

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指向未可信站点的URL重定向(开放重定向)

FOSSBilling 输入验证错误漏洞

FOSSBilling是FOSSBilling开源的一个面向主机服务商和数字服务提供商的计费与客户管理平台。 FOSSBilling 0.8.0之前版本存在输入验证错误漏洞，该漏洞源于重定向模块未验证目标URL的方案，可能导致开放重定向漏洞，被利用进行钓鱼攻击。

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