Attacks pinned to critical React2Shell defect surge, surpass 50 confirmed victims

Security experts have observed a steady increase in malicious activity from a widening pool of attackers seeking to exploit React2Shell, a critical vulnerability disclosed last week in React Server Components.

Authorities are also responding to heightened concern about the defect, with the Cybersecurity and Infrastructure Security Agency shortening the deadline for agencies to patch the vulnerability to Friday. The agency previously set a deadline of Dec. 26 when it added CVE-2025-55182 to its known exploited vulnerabilities catalog last week.

Palo Alto Networks Unit 42 said more than 50 organizations are impacted by attacks involving exploitation of the vulnerability with victims observed in the United States, Asia, South America and the Middle East. 

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