ModHeader Extension Removed by Google and Microsoft Over Security Concerns
In July 2026, Google and Microsoft removed the ModHeader browser extension, which had approximately 1.6 million combined installs across Chrome and Edge, due to the discovery of a dormant data collection module. Security researchers found that version 7.0.18 of ModHeader contained code capable of collecting users' browsing histories and transmitting the encrypted data to an external server. Although the data collection feature was inactive, its presence raised significant privacy concerns, leading to the extension's removal from both browsers. This incident underscores the critical need for rigorous security assessments of browser extensions, especially those with extensive user bases. It highlights the potential risks associated with third-party software components and the importance of continuous monitoring to detect and mitigate hidden threats that could compromise user privacy and security.
Kill Chain