Bitwarden Client Applications Security Report

This document is a security report detailing the findings from a penetration testing and audit conducted by IOActive on Bitwarden client applications and SDKs. The engagement, which took place in November 2024, aimed to identify vulnerabilities and assess the security posture of the applications. The audit uncovered ten issues, five of which were resolved after the assessment, while three were deemed not feasible to address, and two are currently under planning and research. The report outlines the methodology used during the audit, which included static and dynamic application security testing, cryptographic analysis, and exploit simulation. Additionally, it provides a summary of critical issues such as an open redirect vulnerability and various denial of service issues, along with their status and resolution steps. The report aims to ensure transparency regarding the security assessment process and the measures taken to address identified vulnerabilities.