Zulip Desktop 0.5.10 introduced a certificate validation handler to support the undocumented ignoreCerts option available by manually editing the configuration file. However, the handler inadvertently disabled all certificate validation, whether or not ignoreCerts was enabled, except during initial association with the server.
The information has been provided by Vendor
The original article can be found at:https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/
Zulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.
Zulip Desktop before 5.2.0