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CVE-2026-53666

MEDIUM
6.1
CVSS 3.1
Description
React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.

Metadata

CVE ID
CVE-2026-53666
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-09 20:50 UTC
Published
2026-07-27 21:14 UTC
Last updated
2026-07-28 15:19 UTC
Primary CWE
CWE-470
CWE-470: Use of Externally-Controlled Input to Select Classe…
Vendor / Product
remix-run / react-router
Sources
cve.org  ·  NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
remix-run react-router — >= 6.4.0, < 7.18.0
Weakness (CWE)
CWESourceDescription
CWE-470 cna CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
6.1 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References (5)
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