CVE-2026-63228: Three Learning Koollab Lms

Low severity, CVSS 2.6. EPSS: 0.2% chance of exploitation in the next 30 days.

An unrestricted image upload vulnerability in Koollab LMS allowed an authenticated attacker to upload malicious content disguised as an image file via the feedback mail registration endpoint, potentially enabling further attacks on the server.

Affected products

• Three Learning Koollab Lms: version 5.3.2 only

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