CVE-2026-63234: Vulnerability in Three Learning Koollab LMS
CVE-2026-63234 is a critical vulnerability in Three Learning's Koollab LMS version 5.3.2. It involves a SQL injection and unsafe deserialization flaw in the manual mark assessment endpoint. An authenticated attacker can exploit this to inject malicious input, control data passed to the unserialize() function, write a webshell to a publicly accessible location, and execute arbitrary code on the server.
AI Analysis
Technical Summary
This vulnerability combines SQL injection and unsafe deserialization in Koollab LMS 5.3.2, specifically through the manual mark assessment endpoint. An attacker with authentication privileges can manipulate input to perform SQL injection and control the unserialize() function's data, enabling them to write a webshell on the server and execute arbitrary code. The CVSS 3.1 score is 9.9, indicating critical severity with network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code on the server hosting Koollab LMS, potentially leading to full system compromise, data breach, and persistent unauthorized access via a webshell. The vulnerability affects confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been provided at this time. Until a patch is available, restrict access to the manual mark assessment endpoint to trusted users only and monitor for suspicious activity related to unserialize() usage.
CVE-2026-63234: Vulnerability in Three Learning Koollab LMS
Description
CVE-2026-63234 is a critical vulnerability in Three Learning's Koollab LMS version 5.3.2. It involves a SQL injection and unsafe deserialization flaw in the manual mark assessment endpoint. An authenticated attacker can exploit this to inject malicious input, control data passed to the unserialize() function, write a webshell to a publicly accessible location, and execute arbitrary code on the server.
CVSS v3.1
Score 9.9critical
Affected software
Three Learning
Koollab LMS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability combines SQL injection and unsafe deserialization in Koollab LMS 5.3.2, specifically through the manual mark assessment endpoint. An attacker with authentication privileges can manipulate input to perform SQL injection and control the unserialize() function's data, enabling them to write a webshell on the server and execute arbitrary code. The CVSS 3.1 score is 9.9, indicating critical severity with network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code on the server hosting Koollab LMS, potentially leading to full system compromise, data breach, and persistent unauthorized access via a webshell. The vulnerability affects confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been provided at this time. Until a patch is available, restrict access to the manual mark assessment endpoint to trusted users only and monitor for suspicious activity related to unserialize() usage.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CSA
- Date Reserved
- 2026-07-16T02:33:02.674Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a699fbb9c2644c7f814eb57
Added to database: 07/29/2026, 06:37:47 UTC
Last enriched: 08/05/2026, 14:56:48 UTC
Last updated: 09/10/2026, 20:00:36 UTC
Views: 71
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