CVE-2026-63239: Three Learning Koollab Lms

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A hard-coded AWS IAM credentials vulnerability in Koollab LMS allowed an attacker to access shared multi-tenant S3 buckets and SQS queues, exposing sensitive data and enabling malicious content injection, job manipulation, or email interception.

Affected products

• Three Learning Koollab Lms: version 5.3.2 only

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