Cross-site Scripting (XSS) - Stored in convos-chat/convos

Valid

Reported on

Dec 28th 2021


Description

The Convos is an open source multi-user chat that runs in a web browser. You can't use SVG extension in Convos' chat window, but you can upload .html extension. This causes Stored XSS. Also, after uploading a file, it does not log in, and XSS occurs even if you connect.

Proof of Concept

Username : whwjddnjs142@gmail.com
Password : qwer12211@

1. Open the https://demo.convos.chat/login and Login as to above account
2. Go to https://demo.convos.chat/chat/irc-demo-irc-convos/<chat room name>
3. File Upload a html file 
4. When you upload a file, an upload link is created in the comment form.
5. Please connect after attaching ".html" after the link

Video : https://www.youtube.com/watch?v=AfrsOY2S0Nc

Impact

Through this vulnerability, an attacker is capable to execute malicious scripts.

We are processing your report and will contact the convos-chat/convos team within 24 hours. a year ago
Pocas modified the report
a year ago
We have contacted a member of the convos-chat/convos team and are waiting to hear back a year ago
convos-chat/convos maintainer validated this vulnerability a year ago
Pocas has been awarded the disclosure bounty
The fix bounty is now up for grabs
convos-chat/convos maintainer marked this as fixed in 6.48 with commit 5c0a1e a year ago
The fix bounty has been dropped
This vulnerability will not receive a CVE
convos-chat/convos maintainer
a year ago

Thank you! Appreciate it :)

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