CVE-2026-63232: Three Learning Koollab LMS SQL injection and RCE in assessment reinforcement

CVE-2026-63232 · Severity: critical · CVSS 9.9 · Published 2026-07-29

Koollab LMS, a cloud-based learning management system used for corporate training and assessments, contains a critical security flaw. An authorized user, such as a student or instructor, can exploit the assessment reinforcement feature to take full control of the server. This could lead to the theft of sensitive student data, complete service disruption, or the use of the platform to launch further attacks.

Technologies: Three Learning Koollab LMS. Vendors: Three Learning.

Quick answers

Is CVE-2026-63232 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-63232 being exploited in the wild.
How severe is CVE-2026-63232?
Critical severity, with a CVSS score of 9.9, published 29 July 2026.
Which products and versions are affected?
Three Learning Koollab LMS 5.3.2.
Is there a fix for CVE-2026-63232?
A patch was published on 2026-04-26: Vendor patched cloud instances Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-63232 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-63232?
Check whether you run Three Learning Koollab LMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A critical vulnerability exists in Koollab LMS version 5.3.2 due to a combination of SQL injection and unsafe deserialization. An authenticated attacker can exploit the assessment reinforcement endpoint to inject malicious data that is subsequently passed to the PHP unserialize() function. By controlling the serialized input, an attacker can achieve remote code execution (RCE), allowing them to write a webshell to a publicly accessible directory. This vulnerability is reachable over the network and requires low-level authentication. The vendor has patched all cloud-hosted instances, and as a SaaS product, no manual user action is required.

Affected products

  • Three Learning Koollab LMS 5.3.2

Timeline

  • 2026-04-14: disclosed: Vendor disclosure
  • 2026-04-26: patched: Vendor patched cloud instances
  • 2026-07-29: advisory: Public release of advisory

References

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