Proton Data Breach
Proton experienced a data breach that was reported on November 1, 2025. Proton Exposes 300 Million Stolen Credentials — 49% Include Passwords
Key Facts
- Organization
- Proton
- Date Reported
- November 1, 2025
- Incident Type
- unauthorized access
- Severity Score
- 6/10
- Confidence Level
- medium
- Tags
Source
View original source - External link to primary source documentation
Understanding unauthorized access Incidents
Unauthorized access breaches occur when attackers gain entry to systems without permission through credential theft, vulnerability exploitation, or social engineering.