CVE-2026-63233 — CRITICAL (9.9)

Vulnerability Description

A SQL injection and unsafe deserialisation vulnerability in Koollab LMS allowed an authenticated attacker to inject through the assessment overall answer endpoint, control data passed to unserialize(), write a webshell to a publicly accessible location, and execute arbitrary code on the server.

CVSS Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-89

References

https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/

FAQ

What is CVE-2026-63233?

CVE-2026-63233 is a vulnerability with a CVSS score of 9.9 (CRITICAL). A SQL injection and unsafe deserialisation vulnerability in Koollab LMS allowed an authenticated attacker to inject through the assessment overall answer endpoint, control data passed to unserialize()...

How severe is CVE-2026-63233?

CVE-2026-63233 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-63233?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.