CVE-2022-21650 Stored XSS via html file upload in convos
Attackers can execute malicious scripts via stored XSS by uploading HTML files, affecting Convos chat users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2022-21650?
CVE-2022-21650 is a high-severity cross-site scripting vulnerability in convos-chat convos, published on 4 Jan 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2022-21650?
It affects 1 product.
Products include Convos Convos.
How do I fix CVE-2022-21650?
No fix has been published for CVE-2022-21650 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2022-21650 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-21650 exists.
Other vulnerabilities in convos-chat convos
Sources
Also known as GHSA-mm2v-4v7g-m695.