Cross-site Scripting (XSS) - Stored via xHTML file upload in francoisjacquet/rosariosis


Reported on

Apr 27th 2022


rosariosis is vulnerable to Stored XSS in the File upload in Assignments by uploading an xHTML file with the javascript code inside.

Proof of Concept


<?xml version="1.0"?>
<html:html xmlns:html=''>

Step to reproduce

From attacker side (student)

1.Login to the demo environment by student account (student/student)
2.In the left menu, go to GRADES -> Assignments
3.Click on Add and subtract assignment
4.Click Choose file and upload the phish xHTML file above

From victim side (teacher)

1.Login to the demo environment by teacher account (teacher/teacher)
2.In the left menu, go to GRADES -> Grades
3.Click on Student S Student student
4.Click View online in the Submission column
5.Click on Download link and you will see the XSS is triggered


This vulnerability has the potential to phish user to another page and trick user to steal cookies and gain unauthorized access to that user's account through the stolen cookies.

We are processing your report and will contact the francoisjacquet/rosariosis team within 24 hours. a month ago
KhanhCM modified the report
a month ago
We have contacted a member of the francoisjacquet/rosariosis team and are waiting to hear back a month ago
François Jacquet validated this vulnerability a month ago
KhanhCM has been awarded the disclosure bounty
The fix bounty is now up for grabs
The researcher's credibility has increased: +7
François Jacquet confirmed that a fix has been merged on 90842c a month ago
François Jacquet has been awarded the fix bounty
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