CVE-2022-21650
Stored XSS via html file upload in convos
- State
- Published
- Severity
- 7.6 High
- Published
- Jan 4, 2022
- Updated
- Apr 22, 2025
- Reserved
- Nov 16, 2021
Description
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 a file with an .html extension. By uploading an SVG file with an html extension the upload filter can be bypassed. This causes Stored XSS. Also, after uploading a file the XSS attack is triggered upon a user viewing the file. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.6 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N | GitHub_M |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
convosconvos-chat |
|
References
- https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#First-vulnerability
- https://github.com/convos-chat/convos/commit/5c0a1ec9a2c147bc3b63fd5a48da5f32e18fe5df
- https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/
- https://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695
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