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CVE-2026-53667— React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)

Quick assessment

Affected
remix-run react-router
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

remix-run react-router是remix-run的路由管理库。 remix-run react-router 7.11.0版本至7.17.0版本存在跨站脚本漏洞，该漏洞源于RSCErrorHandler缺少协议验证，允许来自不可信来源的重定向。

CVSS 6.9 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
remix-run react-router >= 7.11.0, < 7.18.0 affected
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I. Basic Information for CVE-2026-53667

Vulnerability Information
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Vulnerability Title
React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
remix-run react-router 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
remix-run react-router是remix-run的路由管理库。 remix-run react-router 7.11.0版本至7.17.0版本存在跨站脚本漏洞，该漏洞源于RSCErrorHandler缺少协议验证，允许来自不可信来源的重定向。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
remix-run react-router >= 7.11.0, < 7.18.0 -

II. Public POCs for CVE-2026-53667

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III. Intelligence Information for CVE-2026-53667

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Patches & Fixes for CVE-2026-53667 (2)

Vendor Advisories for CVE-2026-53667 (1)

Vendor Pages for CVE-2026-53667 (1)

Same Patch Batch · remix-run · 2026-07-27 · 5 CVEs total

CVE-2026-55685 8.7 HIGH React Router: Unauthenticated Denial of Service via Inefficient Route Matching
CVE-2026-53668 6.9 MEDIUM React Router: Open redirect can lead to XSS
CVE-2026-53666 6.1 MEDIUM React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR
CVE-2026-53669 5.1 MEDIUM React Router: Open redirect via backslash in <Link> and useNavigate (CVE-2025-68470 bypass

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-79

V. Comments for CVE-2026-53667

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