Hacking Cointelegraph and CoinMarketCap: the Importance of Non-Custodial Wallets

On June 20, 2025, users of CoinTelegraph and CoinMarketCap faced a hacking attempt through a pop-up window offering to connect a crypto wallet. The malicious script was immediately removed, but the attack highlighted the vulnerability of even reliable platforms. CoinMarketCap and CoinTelegraph quickly took action to mitigate the fallout, but the incident demonstrates the rise of attacks aimed at stealing data from wallets. These attacks leverage standard Web3 wallet connection features, making them more convincing. As a result, 39 users were affected with losses exceeding $18,000.

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These incidents show that even the most reliable crypto platforms can fall victim to attacks aimed at compromising wallets. Users should be especially cautious when interacting with pop-up windows and always verify their authenticity. Using non-custodial wallets and trusting verified sources of information can help minimize risks.