Zulip Server before 2.1.5 has Incorrect Access Control because 0198_preregistrationuser_invited_as adds the administrator role to invitations.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14215
Reference (s):
- https://blog.zulip.com/2020/06/17/zulip-server-2-1-5-security-release/