As reported by The Hacker News, a dangerous new campaign targeting browser extensions has been spotted online. So far, at least 16 extensions have been compromised with over 600,000 Chrome users now at risk of having their browsing data and their account credentials exposed online.

A hacker phished a Cyberhaven employee to upload a malicious version of the company's Chrome extension, but it may not be the only victim.

Hackers have compromised several different companies' Chrome browser extensions in a series of intrusions dating back to mid-December, according to one of the victims and experts who have examined the campaign.

The attack began after a hacker successfully targeted a Cyberhaven employee via a phishing email that was sent to Chrome extension developers. The employee, believing the email was an official Google contact, clicked the email and input their login credentials on the phishing page.

Hackers were reportedly able to modify several Chrome extensions with malicious code this month after gaining access to admin accounts through a phishing campaign. The cybersecurity company Cyberhaven shared in a blog post this weekend that its Chrome extension was compromised on December 24 in an attack that appeared to be “targeting logins to specific social media advertising and AI platforms.

A new attack campaign has targeted known Chrome browser extensions, leading to at least 16 extensions being compromised and exposing over 600,000 users to data exposure and credential theft.

The publishers of browser extensions on the Google Chrome Web Store were reportedly targeted via a phishing campaign.

Other extensions possibly affected include Internxt VPN, VPNCity, Uvoice, and ParrotTalks, as Bleeping Computer writes. Cyberhaven says hackers pushed an update (version 24.10.4) of its Cyberhaven data loss prevention extension containing the malicious code on Christmas Eve at 8:32PM ET.

Cyberhaven, a California-based cyber security firm says it was recently hacked on Christmas Eve, and that the hackers were targeting Chrome extensions. Cyberhaven doesn’t mention what the reasoning for the attack was,