CVE-2021-20874: Groupsession

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Incorrect permission assignment for critical resource 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 access arbitrary files on the server and obtain sensitive information via unspecified vectors.

Affected products

• Groupsession Groupsession: up to and including 5.1.1

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