The company has not disclosed how many users were affected or whether any wallets were compromised as a result of the exploit.
Hackers exploited a vulnerability in CoinMarketCap’s front-end system, using a seemingly harmless doodle image to inject malicious code that triggered fake wallet verification pop-ups across the site.
The breach, confirmed by CoinMarketCap, used its backend API to deliver a manipulated JSON payload that embedded JavaScript into the homepage according to blockchain security firm Coinspect Security.
Attendees at Def Con, one of the world’s largest hacking conferences, are used to weird shenanigans, such as a seemingly innocuous wall of computer screens that display people’s passwords sniffed over the conference Wi-Fi network. But at this year’s event, even conference veterans were confused and concerned when their iPhones started showing pop-up messages prompting them to connect their Apple ID or share a password with a nearby Apple TV.
