Proton Exploit -

The Sonar Research team identified the vulnerability during a routine audit of Proton's open-source repositories. The issue stemmed from how the web application handled user-controlled HTML. While senders need the ability to style messages, failing to properly sanitize certain tags can allow malicious tags to execute in a reader's browser. How the Exploit Worked

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 Proton Exploit

The attack required a specific sequence of actions to succeed, which limited its real-world viability: The Sonar Research team identified the vulnerability during

Proton Mail XSS Vulnerability: A Deep Dive into the 2022 Exploit Proton Exploit