Is CVE-2026-112374 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-112374?

CVE-2026-112374 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-112374

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.