Ensure you are using the latest version of any Proton applications.
After researchers disclosed the bug in June 2022, Proton developed and deployed a fix by early July 2022. Proton Exploit
Proton Mail XSS Vulnerability: A Deep Dive into the 2022 Exploit Ensure you are using the latest version of
Avoid clicking unexpected links in emails, even from seemingly secure providers. Proton Exploit
The vulnerability was strictly limited to the web interface; non-web Proton Mail apps (iOS/Android) were never affected. Protecting Your Data