CVE-2021-31520: Trend Micro Im Security

High severity, CVSS 8.1. EPSS: 3.9% chance of exploitation in the next 30 days.

A weak session token authentication bypass vulnerability in Trend Micro IM Security 1.6 and 1.6.5 could allow an remote attacker to guess currently logged-in administrators' session session token in order to gain access to the product's web management interface.

Affected products

• Trend Micro Im Security: version 1.6 only; version 1.6.5 only

Published 2021-05-10. Last modified 2026-06-17.