# CVE-2026-63233: Three Learning Koollab LMS SQL injection and RCE in assessment endpoint

Source: https://junglewise.ai/threats/cve-2026-63233-three-learning-koollab-lms-sql-injection-and-rce-in-assessment  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-63233 · Severity: critical · CVSS 9.9 · Published 2026-07-29

Koollab LMS is a cloud-based learning management system used for e-learning and training administration. A critical vulnerability allows an authenticated user to execute malicious code on the server by exploiting the assessment answer system. This could lead to a complete takeover of the platform, unauthorized access to student data, and the ability to disrupt educational operations.

Technologies: [Three Learning Koollab LMS](https://junglewise.ai/threats/technologies/koollab-lms). Vendors: [Three Learning](https://junglewise.ai/threats/vendors/three-learning).

## Quick answers

**Is CVE-2026-63233 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63233 being exploited in the wild.

**How severe is CVE-2026-63233?** 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-2026-63233?** 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-2026-63233 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-63233?** 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

The vulnerability exists in the 'assessment overall answer' endpoint of Koollab LMS. An authenticated attacker can perform a SQL injection to manipulate data that is subsequently passed to the PHP unserialize() function. By controlling the input to this function, an attacker can achieve remote code execution (RCE) through object injection. This allows the attacker to write a webshell to a publicly accessible directory on the server. The vendor has patched all cloud-hosted instances, and as a SaaS product, no 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

- [https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/](https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/)

## Related threats

- [Three Learning Koollab LMS business logic bypass in SCORM commit endpoint](https://junglewise.ai/threats/cve-2026-63242-three-learning-koollab-lms-business-logic-bypass-in-scorm-commit)
- [Three Learning Koollab LMS IDOR in course completion query](https://junglewise.ai/threats/cve-2026-63241-three-learning-koollab-lms-idor-in-course-completion-query)
- [Three Learning Koollab LMS information disclosure in course status endpoint](https://junglewise.ai/threats/cve-2026-63240-three-learning-koollab-lms-information-disclosure-in-course)
- [Three Learning Koollab LMS hard-coded AWS IAM credentials](https://junglewise.ai/threats/cve-2026-63239-three-learning-koollab-lms-hard-coded-aws-iam-credentials)
- [Three Learning Koollab LMS authentication bypass in 2FA endpoint](https://junglewise.ai/threats/cve-2026-63238-three-learning-koollab-lms-authentication-bypass-in-2fa-endpoint)