CVE-2026-63233: Three Learning Koollab LMS · SQL Injection
Affects Three Learning Koollab LMSSource CVE Database V5
Not known to be exploited · CVSS 9.9 Critical.
Data as of 28 Oct 2026, 05:11 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 29 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Three LearningKoollab LMS | Affected
| Fixed in– |
AI-suggested
Until an official fix is available, restrict access to the assessment overall answer endpoint to trusted users only and monitor for suspicious activity. Avoid exposing the LMS server to untrusted networks and consider additional application-layer protections to mitigate exploitation risk.
Description
CVE-2026-63233 is a critical vulnerability in Three Learning's Koollab LMS version 5.3.2. It involves a SQL injection combined with unsafe deserialization that allows an authenticated attacker to inject malicious input through the assessment overall answer endpoint. This can lead to control over data passed to the unserialize() function, enabling the attacker to write a webshell to a publicly accessible location and execute arbitrary code on the server.