CVE-2021-20875: Groupsession

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL.

Affected products

• Groupsession Groupsession: up to and including 5.1.1

Published 2021-12-24. Last modified 2026-06-17.