Update about reported XSS issue

Proton Team

Share this page

A couple of days ago, a video was circulated online that claimed Proton Mail is susceptible to a XSS (cross-site scripting) issue which raised some concerns among Proton Mail users. We want to clarify that this does not impact the current version of Proton Mail(new window).

XSS issue

Proton Mail is constantly making security improvements through our beta process and we appreciate all the assistance we have received from the community in helping us make Proton Mail better. The concept of encrypting on the client side is a relatively new one and comes with its own security challenges which we are working diligently to tackle.

The Proton Mail security team has reviewed the video and confirmed that this particular security issue is not present on the live version of Proton Mail. The video is showing an earlier development version of Proton Mail that was originally released on May 10, 2014 for limited testing, and is not used in the current production systems.

We are supportive of all efforts to improve the security of Proton Mail and appreciative of our security contributors. Security inquiries can always be directed to security@proton.me

Protect your privacy with Proton
Get a free account

Share this page

Proton Team

We are scientists, engineers, and specialists from around the world drawn together by a shared vision of protecting freedom and privacy online. Proton was born out of a desire to build an internet that puts people before profits, and we're working to create a world where everyone is in control of their digital lives.

Related articles

The first month of 2023 has brought brutal layoffs from Big Tech, a potential ban of TikTok in the US, and another Twitter breach. But the biggest development of this new year has to be the ascent of ChatGPT.  The chatbot can produce remarkably huma
Hackers were able to steal account details from over 200 million Twitter users and posted the database on a hacking forum in early January 2023. These details include users’ email addresses and Twitter handles, allowing people to potentially identify
From your online shopping receipts to financial statements, your emails contain a great deal of sensitive information about your life, interests, and daily schedule. If you’re concerned about your online privacy, it’s therefore vital to keep your inb
At Proton, we’re committed to building privacy-focused products that are convenient to use and improve your productivity. Last year, we released the new mobile apps for Proton Calendar and Proton Drive, letting you manage your schedule and upload imp
Most email services aren’t secure and limit attachment file sizes, but there are ways to send large files securely. If you’ve ever tried attaching multiple images or video files to an email, you’ll know that it doesn’t always work. We explain ways t
Email wasn’t initially designed to be secure. From spam and phishing attempts to malware, unethical marketers and cybercriminals try to undermine the security and privacy of your inbox every day. Since your inbox stores plenty of sensitive informatio