The COLDCARD Hack became an issue for Bitcoin holders on October 11, 2026, after the X account of Coldcard, a Bitcoin hardware wallet producer, was hacked and a false security alert was posted.
According to the false alert, there were vulnerabilities in the firmware of the Mk4, Mk5, and Q devices, and users should withdraw their money using a fake website.
The company removed the post and called on users to avoid clicking on the link, which is now considered phishing. Moreover, this situation has caused more alarm since it seems that the perpetrators used memories of Coldcard’s wallet security crisis in July, when bad wallet generation resulted in financial losses ranging from $100 million to $130 million.
Although there was a breach, Coldcard has reported that it has not found any indication of access to its internal system. It is investigating how the hackers managed to gain control of its X account.
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What Happened in the COLDCARD Hack?
COLDCARD Hack was based on the dissemination of a false security alert issued via the firm’s X page. According to the attackers, there is a vulnerability in the firmware of various Coldcard hardware wallets, including Mk4, Mk5, and Q wallets, which is dangerous for customers.
It was advised to visit an outside website in order to secure the crypto assets. Nevertheless, such a warning was not real and was aimed at conducting a phishing campaign.
Coldcard stated that it was investigating the situation regarding the posting on their account. In addition, the company also reached out to X support and requested an investigation regarding the malicious activities on their platform.
This example illustrates how attackers are able to abuse a social media account of a legitimate company to make their scam look legitimate. It is possible that users would take orders from the company behind their hardware wallet more seriously.
COLDCARD Hack Exploits July Wallet Crisis
It seems that the attack took advantage of an urgent problem faced by Coldcard users in July 2026 due to a certain mistake in the software, leading to the generation of wallets with low-quality randomness and thus private keys easy to crack with the help of offline attacks.
The estimated losses were roughly between 1,600 and 1,800 BTC, valued at about $100 million and $130 million, respectively. Contrary to the conventional phishing scheme, this type of theft did not involve asking for recovery phrases from the victims.
These include firmware version 4.2.0 for Mk3, 5.6.0 for Mk4/Mk5, and 1.5.0Q for Q.
Nonetheless, wallets that were vulnerable still needed a fresh seed phrase and a transfer of funds to new wallets.
In the case of the COLDCARD Hack, the scam message reused information from the July incident, such as device type and firmware version, to make it appear credible and prompt action by the victims.
Coldcard Reports No Internal Breach
Despite the hack of Coldcard’s official X account, Coldcard denied any signs of the hacking of its internal systems.
No unauthorized access was detected in the logs checked by the firm, and the credentials, along with offline 2-factor authentication, were intact, which is how Coldcard had been securing the system since 2017.
Coldcard has contacted X support to examine the situation further and has speculated on the possibility of some unauthorized access through the platform or its administration; however, the exact mechanism of the attack is unknown yet.
It was noted that there have been some rumors about the selling of X internal tools on dark markets, though the link to the attack could not be proved yet.
The COLDCARD Hack does not confirm any breach of hardware wallets or customer funds.
Who Is at Risk From the COLDCARD Hack?
COLDCARD Hack is mainly a risk for those individuals who have clicked on the phishing link and have provided their wallet data.
Individuals who have the user’s 24-word recovery phrase can potentially access the wallet and empty out the wallet funds.
Users who have not clicked the link and have not provided the recovery phrase to anyone have not yet been verified as potential victims of the hacking attempt.
Users of Coldcard should be careful about how they authenticate the message and must never provide the recovery phrase on any website.
Microsoft Account Hack Highlights Crypto Scam Risks
The social media profile of Coldcard is not the only big brand that has been exploited for posting misleading information about cryptocurrencies. The X profile of Microsoft was also reported to be used in the promotion of a crypto scam.
All these examples illustrate how hackers can take advantage of the good name of popular brands in order to create misleading posts. It should be noted that transactions involving cryptocurrencies cannot be undone, which means that any success with phishing will lead to losses.
The COLDCARD hack highlights how adversaries use actual security breaches in order to trick victims into taking actions without validating them.
Crypto holders need to authenticate any alerts through proper sources while safeguarding their recovery phrases. The security breach will remain limited to the hacking of a social media account until the investigations are complete.
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