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.

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 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.

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 data-loss startup says it was targeted as part of a "wider campaign to target Chrome extension developers."

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,