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CVE-2026-112374— FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API

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.

0.8.9 之前的 FOSSBilling 版本在员工访客登录端点（POST /api/guest/staff/login）中存在跨站请求伪造（CSRF）漏洞。由于 checkGuestClientAuthentication() 函数仅对 client_login 和 client_create 操作实施了白名单限制，而未对 staff_login 进行 CSRF 或 Origin 验证，因此远程攻击者可以强制完成身份验证。攻击者可通过托管一个自动提交的 HTML 表单（其中包含由攻击者控制的凭据），在受害者不知

CVSS 4.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
FOSSBilling FOSSBilling 0.1.0< 0.8.9 affected
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I. Basic Information for CVE-2026-112374

Vulnerability Information
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Vulnerability Title
FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API
Source: CVE Program / CVE List V5
Vulnerability Description
FOSSBilling before 0.8.9 contains a Cross-Site Request Forgery vulnerability in the staff guest login endpoint (POST /api/guest/staff/login) that allows remote attackers to force authentication because checkGuestClientAuthentication() only allowlists client_login and client_create, leaving staff_login without CSRF or Origin validation. Attackers can host an auto-submitting HTML form with attacker-controlled credentials to silently log a victim's browser into the attacker's staff account.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FOSSBilling FOSSBilling 0.1.0 ~ 0.8.9 -

II. Public POCs for CVE-2026-112374

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-112374

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Vendor Advisories for CVE-2026-112374 (2)

Vendor Pages for CVE-2026-112374 (1)

IV. Related Vulnerabilities

Same product: FOSSBilling
Same vendor: FOSSBilling
Same weakness: CWE-352