Vulnerability Details CVE-2022-21650
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 58.1%
CVSS Severity
CVSS v3 Score 7.6
CVSS v2 Score 3.5
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://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695
- https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/
- 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://github.com/convos-chat/convos/security/advisories/GHSA-mm2v-4v7g-m695
- https://www.huntr.dev/bounties/ae424798-de01-4972-b73b-2db674f82368/