When possible, use native desktop or mobile apps which often have different attack surfaces than web-based versions. If you'd like to refine this draft, tell me if you want to:
Analysis of spam and virus filter logs showed no evidence of the exploit being used in the wild by malicious actors. Proton Exploit
An attacker would need to send two carefully crafted emails to the target. When possible, use native desktop or mobile apps
Ensure you are using the latest version of any Proton applications. Ensure you are using the latest version of
In most scenarios, the attack only worked if the victim viewed both emails and clicked a specific link in the second one.
If successful, the script would run in the victim's session, allowing the attacker to "see" what the user sees—effectively stealing the decrypted content of their inbox. Proton's Response and Resolution