Zulip Desktop before 5.4.3 allows XSS because string escaping is mishandled during composition of the HTML for the user interface.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24582
Reference (s):
- https://blog.zulip.com/2020/09/10/zulip-desktop-5-4-3-security-release/