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Critical React Router Vulnerability Let Attackers Access or Modify Server Files

Cybersecuritynews •Abinaya • January 12, 2026

Security researchers have identified critical vulnerabilities in React Router that allow attackers to access or modify server files via directory traversal. The flaws affect multiple packages within the React Router ecosystem and carry a CVSS v3 score of 9.8, classifying them as critical severity. CVE ID Severity Attack Vector Flaw Type CVE-2025-61686 Critical (9.8) Network […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical React Router Vulnerabilities Allow Server File Access Security researchers have identified critical vulnerabilities in React Router that enable attackers to access or modify server files through directory traversal. These flaws impact multiple packages within the React Router ecosystem and have a CVSS v3 score of 9.8, indicating critical severity. 3 sources 45

Extracted Entities

Critical React Router Vulnerability Let Attackers Access or Modify Server Files

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Extracted Entities

Attack Types (1)

CVEs (1)

Platforms (1)