New React bug that can drain all your tokens is impacting ‘thousands of’ websites

A critical vulnerability in React Server Components is being actively exploited by multiple threat groups, putting thousands of websites — including crypto platforms — at immediate risk with users possibly seeing all their assets drained, if impacted.

The flaw, tracked as CVE-2025-55182 and nicknamed React2Shell, allows attackers to execute code remotely on affected servers without authentication. React’s maintainers disclosed the issue on Dec. 3 and assigned it the highest possible severity score.

Shortly after disclosure, GTIG observed widespread exploitation by both financially motivated criminals and suspected state-backed hacking groups, targeting unpatched React and Next.js applications across cloud environments.

What the vulnerability does

React Server Components are used to run parts of a web application directly on a server instead of in a user’s browser. The vulnerability stems from how React decodes incoming requests to these server-side functions.

In simple terms, attackers can send a specially crafted web request that tricks the server into running arbitrary commands, or effectively handing over control of the system to the attacker.

The bug affects React versions 19.0 through 19.2.0, including packages used by popular frameworks such as Next.js. Merely having the vulnerable packages installed is often enough to allow exploitation.

How attackers are using it

The Google Threat Intelligence Group (GTIG) documented multiple active campaigns using the flaw to deploy malware, backdoors and crypto-mining software.

Some attackers began exploiting the flaw within days of disclosure to install Monero mining software. These attacks quietly consume server resources and electricity, generating profits for attackers while degrading system performance for victims.

Crypto platforms rely heavily on modern JavaScript frameworks such as React and Next.js, often handling wallet interactions, transaction signing and permit approvals through front-end code.

If a website is compromised, attackers can inject malicious scripts that intercept wallet interactions or redirect transactions to their own wallets— even if the underlying blockchain protocol remains secure.

That makes front-end vulnerabilities particularly dangerous for users who sign transactions through browser wallets.