CVE-2026-111056: FOSSBilling >= 0.1.0, < 0.8.7

Affected technology

FOSSBilling · >= 0.1.0, < 0.8.7
FOSSBilling

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An attacker can compare the guest-signup response for a target email to determine whether the email belongs to an existing FOSSBilling client. Vendor/CNA’s CVSS 4.0 assessment (base score 6.9/10) rates confidentiality impact as low; integrity and availability impact as none.