CVE-2026-53666

Low

No strong exploitation signal.

CVSS base

6.1 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — probability of exploitation (30 days)

0.4%

33.7th percentile

CISA KEV

Not listed

Weakness / dates

CWE-470

Published 2026-07-27 · modified 2026-08-03

CVSS breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector	N	Network
Attack Complexity	L	Low
Privileges Required	N	None
User Interaction	R	Required
Scope	C	Changed
Confidentiality	L	Low
Integrity	L	Low
Availability	N	None

Timeline

2026-07-27 — Published (NVD)
2026-08-03 — Last modified (NVD)

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.

Affected

shopify

References

Official: NVD · CVE.org