Web Reference: Dec 15, 2025 · In this report, Microsoft Defender researchers share insights from observed attacker activity exploiting this vulnerability. Detailed analyses, detection insights, as well as mitigation recommendations and hunting guidance are covered in the next sections. A 10.0 critical severity vulnerablility affecting server-side use of React.js, tracked as CVE-2025-55182 in React.js and CVE-2025-66478 specifically for the Next.js framework. This vulnerability was responsibly disclosed by myself, Lachlan Davidson on 29 November 2025 PT to the Meta team. Dec 4, 2025 · On December 3, 2025, Meta disclosed a new vulnerability, CVE-2025-55182, which has since been dubbed React2Shell. A second CVE identifier, CVE-2025-66478, was assigned and published to track the vulnerability in the context of Next.js.
YouTube Excerpt: React4Shell
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React4shell React2shell Exploitation Update Cve - Latest Information & Updates 2026 Information & Biography
Details: $50M - $64M
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Last Updated: April 3, 2026
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