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Cloudflare WAF proactively protects against React vulnerability

ID: c4b588af-129b-534b-bb1e-34f30c8a91b7

STIX ID: report--c4b588af-129b-534b-bb1e-34f30c8a91b7

Feed Name: Cloudflare Blog

Threat Score
80/100

Date Published: 2025-12-03

Date Updated: 2026-04-27

Author: Daniele Molteni

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**Critical RCE in React/Next.js (CVE-2025-55182)** — Cloudflare announced protections against a Remote Code Execution vulnerability impacting React 19.0–19.2 and Next.js 15–16 (CVSS 10.0). Cloudflare deployed Managed Rules (IDs: 33aa8a8a948b48b28d40450c5fb92fba and 2b5d06e34a814a889bee9a0699702280) with a default Block action across free and paid plans for traffic proxied through the WAF, advised upgrading to React 19.2.1 and Next.js 16.0.7/15.5.7/15.4.8, and reported no observed exploitation since deployment.

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