CVE-2026-63240
Information disclosure vulnerability
Description
An information disclosure vulnerability in Koollab LMS allowed an authenticated learner to obtain correct quiz answers from the course status endpoint without completing the assessment legitimately, compromising the integrity of assessments.
INFO
Published Date :
July 29, 2026, 7:16 a.m.
Last Modified :
July 29, 2026, 7:16 a.m.
Remotely Exploit :
Yes !
Source :
5f57b9bf-260d-4433-bf07-b6a79e9bb7d4
Affected Products
The following products are affected by CVE-2026-63240
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Validate user authorization before serving quiz answers.
- Ensure assessment completion before revealing answers.
- Implement access controls on course status endpoint.
- Update Koollab LMS to the latest version.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63240.
| URL | Resource |
|---|---|
| https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63240 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63240
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63240 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63240 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4
Jul. 29, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Three Learning', 'product': 'Koollab LMS', 'versions': [{'status': 'affected', 'version': '5.3.2'}], 'defaultStatus': 'unaffected'}] Added Description An information disclosure vulnerability in Koollab LMS allowed an authenticated learner to obtain correct quiz answers from the course status endpoint without completing the assessment legitimately, compromising the integrity of assessments. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Added Reference https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-094/