CVE-2026-63237: Three Learning Koollab Lms

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A TOTP two-factor authentication bypass vulnerability in Koollab LMS allowed an attacker to supply a client-controlled seed to generate a matching one-time password and bypass the second authentication factor, potentially enabling unauthorised access to administrator accounts.

Affected products

• Three Learning Koollab Lms: version 5.3.2 only

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