CVE-2026-112374

FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API

Published Oct 30, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API
First Time appeared Fossbilling
Fossbilling fossbilling
Weaknesses CWE-352
CPEs cpe:2.3:a:fossbilling:fossbilling:-:*:*:*:*:*:*:*
Vendors & Products Fossbilling
Fossbilling fossbilling
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 8, 2026, 2:00 PM
Reserved
Oct 19, 2026, 4:11 PM
Status
Deferred
Published
Oct 30, 2026, 1:18 PM
Modified
Nov 5, 2026, 10:17 PM