287 Chrome Extensions Caught Harvesting Browsing Data from 37M Users

Hackread – Cybersecurity News, Data Breaches, AI and More
Actively Exploited

Overview

A recent investigation by Q Continuum has uncovered that 287 Chrome extensions are leaking private browsing data from approximately 37.4 million users to companies like Similarweb and Alibaba. These extensions, often perceived as harmless tools, have been found to convert users' browsing histories into marketable products. The data breach raises significant privacy concerns, particularly for users who may not be aware that their online activities are being monitored and sold. This incident highlights the need for users to be vigilant about the extensions they install and the permissions they grant. As these extensions may not seem malicious at first glance, it serves as a reminder of the potential risks associated with browser add-ons.

Key Takeaways

  • Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
  • Affected Systems: Chrome extensions, user browsing data
  • Action Required: Users should review and remove any unnecessary or suspicious Chrome extensions and check their permissions.
  • Timeline: Newly disclosed

Original Article Summary

New investigation by Q Continuum reveals 287 Chrome extensions leaking the private browsing data of 37.4 million users to firms like Similarweb and Alibaba. Learn how these harmless tools turn your history into a product.

Impact

Chrome extensions, user browsing data

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should review and remove any unnecessary or suspicious Chrome extensions and check their permissions. Regularly monitoring browser settings and being cautious about the extensions installed is advisable.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Data Breach, Google.

Related Coverage

Google Brings AirDrop Compatibility to Android’s Quick Share Using Rust-Hardened Security

The Hacker News

Google has updated its Quick Share service to enable compatibility with Apple's AirDrop, facilitating easier file sharing between Android and iPhone devices. This feature is currently available for the Pixel 10 lineup and is expected to expand to other devices in the future.

Nov 21, 2025

CISA Adds One Known Exploited Vulnerability to Catalog

All CISA Advisories

CISA has added CVE-2025-13223, a Google Chromium V8 Type Confusion Vulnerability, to its Known Exploited Vulnerabilities Catalog due to evidence of active exploitation. This vulnerability poses significant risks to federal enterprises, prompting CISA to urge timely remediation by all organizations to mitigate potential cyberattacks.

Nov 19, 2025

⚡ Weekly Recap: Fortinet Exploit, Chrome 0-Day, BadIIS Malware, Record DDoS, SaaS Breach & More

The Hacker News

This week, significant cybersecurity threats emerged as hackers exploited new 0-day vulnerabilities in Fortinet and Chrome, infiltrating supply chains and SaaS tools. The rapid response from major companies like Microsoft, Salesforce, and Google highlights the severity of these attacks and the ongoing challenges in securing trusted applications and software updates.

Nov 24, 2025

​​Spyware Allows Cyber Threat Actors to Target Users of Messaging Applications​

All CISA Advisories

CISA has identified that various cyber threat actors are using commercial spyware to target users of mobile messaging applications, employing tactics such as phishing, zero-click exploits, and impersonation. The focus is primarily on high-value individuals including government and military officials, indicating a serious threat to sensitive communications.

Nov 24, 2025

HashJack Attack Uses URL ‘#’ to Control AI Browser Behavior

Hackread – Cybersecurity News, Data Breaches, Tech, AI, Crypto and More

Cato Networks has identified a new vulnerability known as HashJack, which exploits the '#' symbol in URLs to execute malicious commands in AI browsers. While Microsoft and Perplexity have addressed this flaw, Google's Gemini remains vulnerable, highlighting a significant risk for users of that platform.

Nov 29, 2025

Google fixes Android vulnerabilities “under targeted exploitation” (CVE-2025-48633, CVE-2025-48572)

Help Net Security

Google has addressed 51 vulnerabilities in Android, including two high-severity flaws (CVE-2025-48633 and CVE-2025-48572) that are potentially under targeted exploitation. Both vulnerabilities impact the Android Framework, which is essential for app development, and could allow malicious applications to access sensitive information.

Dec 2, 2025