CVE-2026-63238: Three Learning Koollab Lms

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An authentication bypass vulnerability in Koollab LMS allowed an unauthenticated attacker to take over any account, including administrator accounts, by supplying a valid user UUID without providing primary credentials via the 2FA validation endpoint.

Affected products

• Three Learning Koollab Lms: version 5.3.2 only

Published 2026-07-29. Last modified 2026-07-30.