Bitwarden Web Application Security Audit Report

This document is a technical report detailing the findings from a security audit conducted on the Bitwarden web application by the cybersecurity firm Cure53 in August 2023. The audit involved penetration testing and was executed by a team of two senior testers over a two-day period. The report outlines two significant issues identified during the assessment. The first issue, related to storage-enabled unlocking of client-side premium features, was classified as a low business risk, as it does not expose sensitive data. The second issue involved the absence of password complexity checks on vault exports, which was addressed post-assessment by implementing a password complexity meter. The report emphasizes the importance of backend validation for premium features and recommends complexity checks for passwords to mitigate brute-force attack risks. Additionally, the report includes a copy of the findings from Cure53 for transparency and completeness.