SQL Injection and Unsafe Deserialization Flaw in Koollab LMS
CVE-2026-63233

9.9CRITICAL

Key Information:

Vendor

Three Learning

Status
Koollab Lms
Vendor
CVE Published:
29 July 2026

What is CVE-2026-63233?

A vulnerability in Koollab LMS allows authenticated attackers to exploit SQL injection and unsafe deserialization. By targeting the assessment overall answer endpoint, attackers can manipulate data passed to the unserialize() function. This flaw may lead to the execution of arbitrary code on the server, enabling potential web shell deployment in accessible directories.

Affected Version(s)

Koollab LMS 5.3.2

References

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-20...

CVSS V3.1

Score:
9.9
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.