CVE-2026-63234
Critical
Description
A SQL injection and unsafe deserialisation vulnerability in Koollab LMS allowed an authenticated attacker to inject through the manual mark assessment endpoint, control data passed to unserialize(), write a webshell to a publicly accessible location, and execute arbitrary code on the server.
SeverityCritical
CVSS9.9
Exploit probability—
ProductKoollab LMS
PublishedJul 29, 2026
First seenJul 29, 2026
Weakness typeCWE-89SQL injection
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Three Learning Koollab LMS | 5.3.2 | — |
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