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Click Studios, the Australian software house that develops the enterprise password manager Passwordstate, has warned customers to reset passwords across their organizations after a cyberattack on the password manager.

An email sent by Click Studios to customers said the company had confirmed that attackers had “compromised” the password manager’s software update feature in order to steal customer passwords.

The email, posted on Twitter by Polish news site Niebezpiecznik early on Friday, said the malicious update exposed Passwordstate customers over a 28-hour window between April 20-22. Once installed, the malicious update contacts the attacker’s servers to retrieve malware designed to steal and send the password manager’s contents back to the attackers. The email also told customers to “commence resetting all passwords contained within Passwordstate.”

🚨 Manager haseł PasswordState został zhackowany a komputery klientów zainfekowane.

Producent informuje ofiary e-mailem.

Ten manager haseł jest “korporacyjny”, więc problem będzie dotyczyć przede wszystkim firm… Auć!

(Informacja od Tajemniczego Pedro) pic.twitter.com/PGHhmEKpje

— Niebezpiecznik (@niebezpiecznik) April 23, 2021

Click Studios did not say how the attackers compromised the password manager’s update feature, but emailed customers with a security fix.

The company also said the attacker’s servers were taken down on April 22. But Passwordstate users could still be at risk if the attacker’s are able to get their infrastructure online again.

Enterprise password managers let employees at companies share passwords and other sensitive secrets across their organization, such as network devices — including firewalls and VPNs, shared email accounts, internal databases and social media accounts. Click Studios claims Passwordstate is used by “more than 29,000 customers,” including in the Fortune 500, government, banking, defense and aerospace, and most major industries.

Although affected customers were notified this morning, news of the breach only became widely known several hours later after Danish cybersecurity firm CSIS Group published a blog post with details of the attack.

Click Studios chief executive Mark Sanford did not respond to a request for comment outside Australian business hours.

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