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Critical React Flaw: Hackers Exploit Servers with Ease
4 Dec
Summary
- A critical vulnerability in React Server allows remote code execution.
- Exploitation is easy, requiring only a single unauthenticated HTTP request.
- The flaw, rated a perfect 10, affects widely used web and cloud environments.
A severe vulnerability with a maximum severity rating of 10 has been uncovered in React Server, an open-source package integral to many websites and cloud environments. This critical flaw, identified as CVE-2025-55182, enables attackers to execute malicious code on vulnerable servers with remarkable ease, requiring just a single unauthenticated HTTP request.
The exploit stems from unsafe deserialization within the Flight protocol of React Server Components. This allows specially crafted payloads to influence server-side logic, leading to privileged JavaScript code execution. Security firms Wiz and Aikido reported that the vulnerability has a near 100% success rate and affects the default configurations of popular frameworks like Next.js.
Due to the widespread adoption of React, particularly in cloud infrastructure, and the simplicity of exploitation, security professionals are urging immediate installation of the update released on Wednesday. Users of affected third-party components and frameworks are advised to consult their maintainers for specific guidance on patching and securing their systems.
