Ensure you are using the latest version of any Proton applications.
In June 2022, security researchers from SonarSource discovered a critical Cross-Site Scripting (XSS) vulnerability in the open-source code of Proton Mail. This flaw could have allowed attackers to bypass end-to-end encryption to steal decrypted emails and impersonate victims. The Discovery
Proton Mail XSS Vulnerability: A Deep Dive into the 2022 Exploit 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
Avoid clicking unexpected links in emails, even from seemingly secure providers. Ensure you are using the latest version of
After researchers disclosed the bug in June 2022, Proton developed and deployed a fix by early July 2022.
Shift the tone (e.g., for developers or simpler for general users). The Discovery Proton Mail XSS Vulnerability: A Deep
Add details about other recent fixes (like the patch). Include SEO keywords tailored for cybersecurity audiences. Proton Mail's responsible vulnerability disclosure policy