nextdoor.com Domain Breach Exposure Report

The telemetry indicates a significant exposure event impacting nextdoor.com, with over 251,000 total events recorded between July 2025 and June 2026. The majority of these events (81.2%) are historical data breaches, affecting approximately 204,000 clients. Additionally, there are over 47,000 active infostealer logs (18.8% of events), primarily targeting clients. A notable spike in employee-related events occurred in January 2026, with 667 incidents, suggesting a potential internal compromise or a targeted attack against employees during that period. The primary malware families observed are Rhadamanthys, Redline, and LummaC2, all known for credential theft. The high volume of historical data breaches and active infostealer logs, coupled with the prevalence of credential-stealing malware, elevates the risk to both client and employee data. The focus for remediation should be on strengthening authentication mechanisms, enhancing endpoint security to detect and prevent infostealer infections, and conducting thorough investigations into the January 2026 employee event to understand the root cause and prevent recurrence. Given the nature of the service and the observed data, the most appropriate industry sector is Technology & SaaS.