# CVE-2026-63235: Three Learning Koollab LMS improper access control in login kickout endpoint

Source: https://junglewise.ai/threats/cve-2026-63235-three-learning-koollab-lms-improper-access-control-in-login  
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-2026-63235 · Severity: low · CVSS 3.7 · Published 2026-07-29

Koollab LMS, a cloud-based learning management system used for corporate training and assessments, contains a security flaw in its login management component. An unauthorized individual could exploit this to remotely log out any active user if they know that user's email address. This results in a targeted denial of service, disrupting the learning or testing experience for students and staff.

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-2026-63235 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63235 being exploited in the wild.

**How severe is CVE-2026-63235?** Low severity, with a CVSS score of 3.7, published 29 July 2026.

**Which products and versions are affected?** Three Learning Koollab LMS 5.3.2.

**Is there a fix for CVE-2026-63235?** A patch was published on 2026-04-26: Vendor patched cloud-hosted instances Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63235 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-63235?** 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

An improper access control vulnerability exists within the 'login kickout' endpoint of Koollab LMS version 5.3.2. The endpoint fails to adequately verify the authorization of the requester before processing a session termination command. An unauthenticated remote attacker can exploit this by sending a crafted request containing a target user's email address to the vulnerable endpoint. Successful exploitation results in the immediate termination of the target user's active session, leading to a localized denial of service. The vendor has patched this vulnerability across its SaaS infrastructure.

## Affected products

- Three Learning Koollab LMS 5.3.2

## Timeline

- 2026-04-14: disclosed: Vendor disclosure
- 2026-04-26: patched: Vendor patched cloud-hosted 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)