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CVE-2026-43921— FOSSBilling vulnerable to arbitrary PHP code injection via unescaped config serialization

Quick assessment

Affected
FOSSBilling FOSSBilling
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.

fossbilling是fossbilling团队开源的一种高效计费和客户管理方案。 FOSSBilling 0.6.10版本至0.7.2版本存在代码注入漏洞，该漏洞源于在 方法中，将配置值写入 时未转义单引号，导致具有管理员权限的攻击者可以注入任意PHP代码，并在每次HTTP请求时执行。

AI Predicted 8.1 Difficulty: Trivial EPSS 0.43% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling >= 0.6.10, < 0.8.0 affected
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I. Basic Information for CVE-2026-43921

Vulnerability Information
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Vulnerability Title
FOSSBilling vulnerable to arbitrary PHP code injection via unescaped config serialization
Source: CVE Program / CVE List V5
Vulnerability Description
FOSSBilling is a free, open-source billing and client management system. Versions 0.6.10 through 0.7.2 have a PHP code injection vulnerability in FOSSBilling's `Config::prettyPrintArrayToPHP()` method. When configuration values are updated, string values are written into `config.php` without escaping single quotes. Because `config.php` is loaded via a bare `include` on every HTTP request, an attacker with admin privileges can inject arbitrary PHP code that executes on every subsequent request. Version 0.8.0 contains a patch. Some workarounds are available. Restrict admin access to trusted personnel only; audit `config.php` for unexpected PHP code; and/ or at the reverse proxy/WAF level, restrict access to admin API endpoints that modify configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FOSSBilling 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
fossbilling是fossbilling团队开源的一种高效计费和客户管理方案。 FOSSBilling 0.6.10版本至0.7.2版本存在代码注入漏洞，该漏洞源于在`Config::prettyPrintArrayToPHP()`方法中，将配置值写入`config.php`时未转义单引号，导致具有管理员权限的攻击者可以注入任意PHP代码，并在每次HTTP请求时执行。
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
FOSSBilling FOSSBilling >= 0.6.10, < 0.8.0 -

II. Public POCs for CVE-2026-43921

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III. Intelligence Information for CVE-2026-43921

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Vendor Advisories for CVE-2026-43921 (1)

Same Patch Batch · FOSSBilling · 2026-07-06 · 17 CVEs total

CVE-2026-42341 FOSSBilling has an unauthenticated payment bypass via IPN callback forgery
CVE-2026-42331 FOSSBilling missing authorization in guest Invoice API endpoints
CVE-2026-33734 FOSSBilling has improper SQL neutralization in `Massmailer` recipient filters
CVE-2026-43918 Suspended or inactive FOSSBilling accounts can retain or regain access through existing se
CVE-2026-43927 FOSSBilling has race condition in cart checkout that bypasses promo code usage limits
CVE-2026-43925 FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized
CVE-2026-43928 FOSSBilling: Payment amount not validated in PayPalEmail adapter allows invoice underpayme
CVE-2026-53640 FOSSBilling missing authorization checks on read-only admin API endpoints expose sensitive
CVE-2026-53641 FOSSBilling has stored XSS in client email views via unescaped content in JavaScript templ
CVE-2026-53645 FOSSBilling's missing self-edit prevention in staff permission management allows persisten
CVE-2026-53646 FOSSBilling: Client password reset token reuse allows persistent account takeover
CVE-2026-53643 FOSSBilling allows low-privileged staff accounts to perform unauthorized actions via admin
CVE-2026-53644 FOSSBilling's missing order-state validation allows clients to read and reset API key secr
CVE-2026-53642 FOSSBilling: Unverified clients can access client-area pages when email confirmation is re
CVE-2026-53647 FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Servi
CVE-2026-53648 FOSSBilling: Downloadable product files can be overwritten through filename collisions

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-94

V. Comments for CVE-2026-43921

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