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644K+ Websites at Risk Due to Critical React Server Components Flaw

The Shadowserver Foundation has released an update concerning the "React2Shell" vulnerability, highlighting a substantial attack surface that remains susceptible to exploitation.

JBy Julia KramerDec 11, 20251 min read

The Shadowserver Foundation has released an update concerning the "React2Shell" vulnerability, highlighting a substantial attack surface that remains susceptible to exploitation.

Following enhancements to their scanning infrastructure on Mon, Dec 8, 2025, researchers identified over 644,000 domains and 165,000 unique IP addresses still operating vulnerable instances of React Server Components.

The vulnerability, designated as CVE-2025-55182, is a critical security flaw impacting React Server Components (RSC). It allows remote attackers to execute arbitrary code on the target server without authentication.

The flaw arises from insecure deserialization vulnerabilities in the "Flight" protocol used by React for server-client communication. As it can be exploited without user interaction or authentication, it has been assigned the highest risk ratings.

The vulnerability, designated as CVE-2025-55182, is a critical security flaw impacting React Server Components (RSC).
Julia Kramer · Thehackingpost

Despite the initial disclosure earlier this month, a significant portion of the web remains unpatched, according to Shadowserver's latest data.

The foundation, in collaboration with security partners ValidinLLC and leak_ix, refined their scanning techniques, leading to more accurate detection of affected systems. This discovery underscores that numerous organizations have not yet applied necessary security updates to their applications and server environments.

Security teams and administrators are advised to immediately inspect their systems for potential compromise. The widespread nature of this vulnerability makes it an attractive target for automated exploitation campaigns, where unpatched servers may be targeted for ransomware installation or data theft.

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Organizations utilizing React Server Components should verify their deployments against the latest vendor advisories and apply available patches promptly to address this security gap.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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