{"id":20722,"date":"2026-01-02T14:08:49","date_gmt":"2026-01-02T11:08:49","guid":{"rendered":"https:\/\/oberig-it.com\/uncategorized\/critical-rce-in-react-server-components-cve-2025-55182-and-cve-2025-66478-what-it-means-for-security-teams\/"},"modified":"2026-02-02T17:22:17","modified_gmt":"2026-02-02T14:22:17","slug":"critical-rce-in-react-server-components-cve-2025-55182-and-cve-2025-66478-what-it-means-for-security-teams","status":"publish","type":"post","link":"https:\/\/oberig-it.com\/en\/articles\/critical-rce-in-react-server-components-cve-2025-55182-and-cve-2025-66478-what-it-means-for-security-teams\/","title":{"rendered":"Critical RCE in React Server Components CVE-2025-55182 and CVE-2025-66478: What It Means for Security Teams"},"content":{"rendered":"<h4>What was discovered?<\/h4>\n<p>A critical un-authentication remote code execution (RCE) vulnerability has been disclosed in React Server Components (RSC), tracked as CVE-2025-55182 (and related CVE-2025-66478 in next.js which is built on React).<\/p>\n<p>In short: a specially crafted HTTP request targeting the vulnerable RSC \u201cFlight\u201d component can lead to full server-side code execution, with no authentication required.<\/p>\n<h4>Who is affected?<\/h4>\n<ul>\n<li>Any application using React 19 (versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0) with server components enabled is vulnerable.<\/li>\n<li>Next.js that\u2019s built atop React RSC, is also impacted. Affected versions are: Next.js: 14.3.0-canary, 15.x, and 16.x (App Router)<\/li>\n<li>Beyond React and Next.js, any tooling, bundler or plugin that bundles the vulnerable react-server-dom-* modules may also be at risk.<\/li>\n<li>Given the ubiquity of React and the popularity of Next.js-powered applications, this potentially affects a huge chunk of web-facing services, dashboards and cloud-hosted web applications worldwide, regardless of industry or geography.<\/li>\n<\/ul>\n<h4>What\u2019s the potential impact?<\/h4>\n<ul>\n<li>Full Server Takeover: The vulnerability allows unauthenticated remote code execution on the affected application\u2019s server. This can provide an immediate external foothold and result in complete system compromise.<\/li>\n<li>Ease of Exploitation + No Prerequisites: Because exploiting requires only a crafted HTTP request, no authentication, no special privileges and default configurations are already vulnerable, the attack surface is very large.<\/li>\n<li>Data Exposure, Secret Leakage, Service Disruption: Any sensitive data stored or processed on the server (user data, credentials, tokens, configuration files) can be compromised. Attackers can modify data, exfiltrate secrets or disrupt service availability.<\/li>\n<\/ul>\n<h4>How we test: Cymulate templates &amp; attack scenarios<\/h4>\n<p>To help security teams validate whether their environments are exposed, <a href=\"https:\/\/oberig-it.com\/en\/solution_manf\/cymulate-en\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">Cymulate<\/span><\/a> released three new attack scenarios and two new attack templates in Cymulate Exposure Validation.<\/p>\n<p>On Dec. 4, 2025, we released the first attack scenario React2Shell Scanner (CVE-2025-55182 &amp; CVE-2025-66478) to test and validate threat detection in SIEM and endpoint security.<\/p>\n<p><a href=\"https:\/\/oberig-it.com\/en\/solution_manf\/cymulate-en\/\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-20674 size-full\" src=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png\" alt=\"cymulate buy\" width=\"1400\" height=\"147\" srcset=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png 1400w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-300x32.png 300w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1024x108.png 1024w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-768x81.png 768w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-24x3.png 24w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-36x4.png 36w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-48x5.png 48w\" sizes=\"auto, (max-width: 1400px) 100vw, 1400px\" \/><br \/>\n<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-20677 size-full aligncenter\" src=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1.png\" alt=\"cymulate solutions buy\" width=\"866\" height=\"843\" srcset=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1.png 866w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1-300x292.png 300w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1-768x748.png 768w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1-24x24.png 24w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1-36x36.png 36w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-2-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1-48x48.png 48w\" sizes=\"auto, (max-width: 866px) 100vw, 866px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-20680 size-full\" src=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png\" alt=\"cymulate\" width=\"878\" height=\"624\" srcset=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png 878w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-300x213.png 300w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-768x546.png 768w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-24x17.png 24w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-36x26.png 36w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-3-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-48x34.png 48w\" sizes=\"auto, (max-width: 878px) 100vw, 878px\" \/><\/p>\n<p>Because of the substantial risks associated with exploitation, Cymulate has released <a href=\"https:\/\/github.com\/CymulateResearch\/React2Shell-Scanner\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">a standalone React2Shell-Scanner tool<\/span><\/a> for any security team to test and validate their security controls\u2019 ability to detect an attack that exploits these vulnerabilities.<\/p>\n<p>This is a non-intrusive scanner targeting CVE-2025-55182 (and CVE-2025-66478) that sends benign, harmless payloads, triggering the vulnerable deserialization logic but not executing malicious code and then analyzes server responses to detect if the server exhibits the characteristic error patterns of an unpatched RSC implementation.<\/p>\n<p>In practical terms, this means you can proactively test your public-facing (or internal) React\/Next.js servers to assess exposure, without minimal risk.<\/p>\n<p>When manually inspecting React or Next.js versions, the caret (^) before a version number indicates that the minimum version is set, but the package manager is allowed to automatically install newer minor and patch versions within the same major release.<\/p>\n<p>For instance, &#8220;react&#8221;: &#8220;^19.0.0&#8221; ensures the version won\u2019t fall below 19.0.0, but it may install 19.0.1 or later compatible 19.x.x releases during deployment or reinstallation. This means a project may already be using a patched version, even if the baseline manifest looks vulnerable. As a result, teams must confirm the actual installed version (via lock files or dependency audits).<\/p>\n<p>On Dec. 8, 2025, we released attack scenario CVE-2025-55182\/CVE-2025-66478 &#8211; React RSC Flight deserialization to test and validate WAF protection and alerting with attack simulations based on RSC Flight deserialization requests that contains the prototype-pollution and JavaScript-injection.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-20683 size-full\" src=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png\" alt=\"cymulate solutions\" width=\"1491\" height=\"126\" srcset=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png 1491w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-300x25.png 300w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1024x87.png 1024w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-768x65.png 768w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-24x2.png 24w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-36x3.png 36w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-4-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-48x4.png 48w\" sizes=\"auto, (max-width: 1491px) 100vw, 1491px\" \/><\/p>\n<p>After observing threat actors exploit this vulnerability, we published new IOC-based attack scenarios in the threat feed to test and validate endpoint security and perimeter defenses on Dec. 9.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-20686 size-full\" src=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png\" alt=\"bas cymulate\" width=\"1371\" height=\"232\" srcset=\"https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478.png 1371w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-300x51.png 300w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-1024x173.png 1024w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-768x130.png 768w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-24x4.png 24w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-36x6.png 36w, https:\/\/oberig-it.com\/wp-content\/uploads\/2026\/01\/cymulate-5-krytychnyj-rce-v-komponentah-react-server-cve-2025-55182-ta-cve-2025-66478-48x8.png 48w\" sizes=\"auto, (max-width: 1371px) 100vw, 1371px\" \/><\/p>\n<p>With these new attack scenarios, we published two new exposure validation templates that apply these attack scenarios in advanced campaigns that exploit the vulnerability and mimic advanced tactics utilized by groups like UNC5174, North Korean and Chinese actors as well as others engaged in ransomware, espionage or cryptojacking campaigns.<\/p>\n<p>You can find these new exposure validation templates under \u201cadvanced attacks (APT &amp; TA)\u201d with the names:<\/p>\n<ul>\n<li>React Server Components Exploitation Simulation<\/li>\n<li>React2Shell RCE Simulation<\/li>\n<\/ul>\n<h4>Free tool for every security team to validate the threat<\/h4>\n<p>Because of the\u202fsubstantial\u202frisks associated with\u202fexploitation,\u202fCymulate has released\u202f<a href=\"https:\/\/github.com\/CymulateResearch\/React2Shell-Scanner\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">a standalone\u202fReact2Shell-Scanner tool\u202f<\/span><\/a>for any security team\u202fto test and\u202fvalidate\u202ftheir\u202fsecurity controls\u2019 ability to detect an\u202fattack that exploits these vulnerabilities.<\/p>\n<p>This is a non-intrusive scanner targeting CVE-2025-55182 (and CVE-2025-66478) that sends benign, harmless payloads,\u202ftriggering the vulnerable deserialization logic but\u202fnot\u202fexecuting malicious code and then analyzes server responses to detect if the server exhibits the characteristic error patterns of an unpatched RSC implementation.<\/p>\n<h4>Recommended immediate actions<\/h4>\n<ol>\n<li>Evaluate server applications using the affected components. Manually inspect configurations and installed versions.<\/li>\n<li>Prioritize patching: upgrade all react-server-dom-* packages to 19.0.1, 19.1.2, or 19.2.1 and ensure any Next.js instances are updated to patched releases.<\/li>\n<li>Use NPM audit to check components for known vulnerabilities.<\/li>\n<li>Audit all dependencies: check for any frameworks, plugins or libraries that embed vulnerable RSC modules.<\/li>\n<li>Incorporate simulation of this vulnerability into your annual or quarterly BAS\/red-team exercises, to test detection, response and containment capabilities in case of a real exploit.<\/li>\n<\/ol>\n<p>Source: <a href=\"https:\/\/cymulate.com\/blog\/react-rsc-critical-rce-cve-2025-55182-66478\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\">Critical RCE in React Server Components CVE-2025-55182 and CVE-2025-66478: What It Means for Security Teams<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What was discovered? A critical un-authentication remote code execution (RCE) vulnerability has been disclosed in React Server Components (RSC), tracked as CVE-2025-55182 (and related CVE-2025-66478 in next.js which is built on React). In short: a specially crafted HTTP request targeting the vulnerable RSC \u201cFlight\u201d component can lead to full server-side code execution, with no authentication [&hellip;]<\/p>\n","protected":false},"author":850,"featured_media":20712,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[142],"tags":[],"class_list":["post-20722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Critical RCE in React Server Components CVE-2025-55182 and CVE-2025-66478: What It Means for Security Teams \u261d Oberig IT blog<\/title>\n<meta name=\"description\" content=\"Critical RCE in React Server Components CVE-2025-55182 and CVE-2025-66478: What It Means for Security Teams \u26a1 Oberig IT 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