Email Security & Protection , Email Threat Protection , Fraud Management & Cybercrime

OpenSea Customer Emails Exposed in Third-Party Breach

No Bored Apes Were Harmed In Breach Affecting Millions of Users
OpenSea Customer Emails Exposed in Third-Party Breach

Add the risk of phishing to the woes afflicting patrons of non-fungible token marketplace OpenSea after a rogue email delivery vendor employee downloaded the company's email address database and shared it "with an unauthorized external party."

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Anyone who shared an email address with the marketplace famous for selling blockchain entries tied to digital images of anthropomorphized apes must assume their email address has been comprised, the company says. OpenSea claims to be the largest NFT marketplace; nearly 1.9 million users have made at least one transaction on the platform, shows data from blockchain market firm Dune Analytics.

A blog post from Cory Hardman, the company's head of security, says an employee at email vendor downloaded and shared with an external party OpenSea's customer and newsletter subscriber list.

As a result, OpenSea is warning customers of a heightened likelihood of email phishing attempts. "Malicious actors may try to contact you using an email address that looks visually similar to our official email domain, '' (such as '' or some other variation)," Hardman wrote.

OpenSea's offerings are undergoing a rough patch. Dune Analytics shows OpenSea trading volumes declining sharply this month. Prices aggregated by NFT Price Floor indicates the value of the Bored Ape Yacht Club line of NFT apes has plunged more than 40% since its April high.

OpenSea says it has informed law enforcement authorities and is also cooperating with's ongoing investigation.

A spokesperson tells Information Security Media Group that it took "immediate steps to investigate, contain its impact and determine its source, including hiring a third-party forensic investigations firm." It says it is working closely with OpenSea and reviewing how the email addresses were compromised.

"We believe this resulted from the actions of an employee who had role-specific access privileges that were abused. We do not believe any other clients' data has been compromised, but we are continuing to investigate," the spokesperson says. The employee in question is under suspension pending the outcome of the investigation and no longer has access to company systems, the spokesperson also says.

No Blockchain Addresses Leaked does not have any access to blockchain wallet addresses, and only email addresses were compromised in the process, confirms Anne Fauvre-Willis, OpenSea vice president of special projects. No email content was leaked, only email addresses, she also says on Twitter.

Safety Recommendations

OpenSea offers the following safety recommendations:

  • Be cautious of emails from addresses trying to impersonate OpenSea.
  • Never download anything from an OpenSea email because the company does not include attachments or requests to download anything.
  • Check the URL of any page linked in an OpenSea email; only hyperlinks to '' are sent in legitimate messages.
  • Do not share or confirm your passwords or secret wallet phrases.
  • Never sign a wallet transaction prompted directly from an email.

About the Author

Mihir Bagwe

Mihir Bagwe

Principal Correspondent, Global News Desk, ISMG

Bagwe previously worked at CISO magazine, reporting the latest cybersecurity news and trends and interviewing cybersecurity subject matter experts.

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