🛡️ CVE-2026-53667 — react-router

🟡 CVSS 6.9 — Medium ✅ No Known Exploit CWE-79 OSV
6.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

React Router: RSCErrorHandler Missing Protocol Validation (XSS)

This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8646-j5j9-6r62. React Router was alerted of a code path in the (unstable) RSC error handling path in which redirects from untrusted sources could still result in an XSS vector via attacker-supplied redirect targets

> [!NOTE]

> This only affects your application if you are using the unstable RSC APIs

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity low, availability none.

Weakness class

CVE-2026-53667 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-53667 is recorded against 1 package.

  • react-router

Timeline and source

Published on 23 July 2026 and last revised on 3 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)

Details

Severity MEDIUM
CVSS Score 6.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE CWE-79
Public Exploit ✅ No
Source OSV
Published 2026-07-23
Updated 2026-08-12
Modified 2026-08-03

Affected Packages

Software From version Fixed in
react-router — —

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