Proton AG reported a widespread login outage across all its services on July 10, 2026. The incident halted access to Proton Mail, Proton Calendar, Proton Drive, Proton Pass, Proton VPN, Simple Login, Proton Wallet, and Lumo.

The outage affected every platform: web applications, mobile and desktop apps, játék, and browser extensions. Users could not authenticate via web or native clients, disrupting email, calendar, file storage, password management, and VPN connections.

Engineering teams confirmed the issue and are actively investigating the root cause. Updates posted at 15:35, 15:38, 15:39, 15:40, and 15:42 CEST indicate that restoration efforts are underway, with a focus on restoring normal access as quickly as possible.

The incident highlights the importance of resilient authentication pipelines in end‑to‑end encrypted services. Users relying on Proton’s zero‑knowledge architecture face temporary loss of secure access, underscoring the need for robust monitoring and rapid incident response in privacy‑centric product stacks.