React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| remix-run | react-router | affected |
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| Vendor | Product | Versions | ||||||||
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| Remix-run | React-router |
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| Source | ID | Title |
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Github GHSA |
GHSA-h8fp-f39c-q6mh | React Router: RSCErrorHandler Missing Protocol Validation (XSS) |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.355% probability within 30 days)
| Type | Values Removed | Values Added |
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| Weaknesses | CWE-601 | |
| References |
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| Metrics |
threat_severity
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ssvc
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Remix-run
Remix-run react-router |
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| Vendors & Products |
Remix-run
Remix-run react-router |
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667) | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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