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CVE-2026-53647— FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint

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 0.5.3版本至0.7.2版本存在安全漏洞，该漏洞源于Guest服务apiKey/get_info API端点未经验证，任何持有有效API密钥的调用者可检索密钥数据库记录中的自定义配置参数，可能导致泄露定价层级、功能标志、速率限制、有效期覆盖或访问范围数据等业务敏感信息。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling >= 0.5.3, < 0.8.0 affected
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I. Basic Information for CVE-2026-53647

Vulnerability Information
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Vulnerability Title
FOSSBilling vulnerable to unauthenticated API key configuration disclosure via guest Serviceapikey get_info endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
FOSSBilling is a free, open-source billing and client management system. In versions 0.5.3 through 0.7.2, the Guest `serviceapikey/get_info` API endpoint is accessible without authentication. Any caller with a valid API key can retrieve all custom configuration parameters (`custom_*` fields) stored in the key's database record. These custom fields are populated by billing administrators and can contain business-sensitive data such as pricing tiers, feature flags, rate limits, expiry overrides, or access scope data. Version 0.8.0 patches the issue. Some workarounds are available. Administrators can avoid storing sensitive data in `custom_*` API key configuration fields, monitor API logs for suspicious calls to `/api/guest/serviceapikey/get_info`, and/or disable the Serviceapikey module if not in active use.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
FOSSBilling 信息泄露漏洞
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 0.5.3版本至0.7.2版本存在安全漏洞，该漏洞源于Guest服务apiKey/get_info API端点未经验证，任何持有有效API密钥的调用者可检索密钥数据库记录中的自定义配置参数，可能导致泄露定价层级、功能标志、速率限制、有效期覆盖或访问范围数据等业务敏感信息。
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 >= 0.5.3, < 0.8.0 -

II. Public POCs for CVE-2026-53647

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III. Intelligence Information for CVE-2026-53647

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Vendor Advisories for CVE-2026-53647 (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-2026-43921 FOSSBilling vulnerable to arbitrary PHP code injection via unescaped config serialization
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-2026-53648 FOSSBilling: Downloadable product files can be overwritten through filename collisions

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-200

V. Comments for CVE-2026-53647

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