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CVE-2026-27708— FOSSBilling: IDOR in Servicecustom Client API allows cross-client data access

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 存在安全漏洞，该漏洞源于Servicecustom Client API的__call方法未验证认证客户端是否拥有所获取的订单，可能通过IDOR导致跨客户端数据泄露。认证客户端可通过猜测连续订单ID访问其他客户的自定义服务，导致读取客户的服务配置数据。

AI Predicted 7.4 Difficulty: Easy EPSS 0.36% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling < 0.8.0 affected
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I. Basic Information for CVE-2026-27708

Vulnerability Information
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Vulnerability Title
FOSSBilling: IDOR in Servicecustom Client API allows cross-client data access
Source: CVE Program / CVE List V5
Vulnerability Description
FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, the Servicecustom Client API's __call method accepts an order_id parameter and fetches the associated order without verifying the authenticated client owns it, potentially exposing cross-client data through IDOR. An authenticated client can access any other client's custom service by guessing sequential order IDs. This can lead to a confidentiality breach — attackers can read client PII (name, email, phone, address, company details, VAT number) and service configuration data belonging to other clients. This issue has been fixed in version 0.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FOSSBilling 权限许可和访问控制问题漏洞
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 存在安全漏洞，该漏洞源于Servicecustom Client API的__call方法未验证认证客户端是否拥有所获取的订单，可能通过IDOR导致跨客户端数据泄露。认证客户端可通过猜测连续订单ID访问其他客户的自定义服务，导致读取客户的服务配置数据。
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 < 0.8.0 -

II. Public POCs for CVE-2026-27708

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III. Intelligence Information for CVE-2026-27708

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Vendor Advisories for CVE-2026-27708 (1)

Vendor Pages for CVE-2026-27708 (1)

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-284

V. Comments for CVE-2026-27708

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