CVE-2020-6583: Bigprof Online Invoicing System

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

BigProf Online Invoicing System (OIS) through 2.6 has XSS that can be leveraged for session hijacking. An attacker can exploit the XSS vulnerability, retrieve the session cookie from the administrator login, and take over the administrator account via the Name field in an Add New Client action.

Affected products

• Bigprof Online Invoicing System: up to and including 2.6

Published 2020-01-08. Last modified 2026-06-17.