Security Assessment: CVE-2025-61686 - Repository Not Affected

SECURITY_ASSESSMENT.md

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+# Security Assessment: React Router CVE-2025-61686
+
+**Assessment Date:** January 15, 2026  
+**Vulnerability:** CVE-2025-61686 (Critical - CVSS 9.8)  
+**Status:** ✅ NOT AFFECTED
+
+## Executive Summary
+
+This repository has been assessed for the critical React Router vulnerability (CVE-2025-61686) that allows attackers to access or modify server files via directory traversal. **The repository is NOT affected by this vulnerability.**
+
+## Vulnerability Details
+
+### CVE-2025-61686 Overview
+- **Severity:** Critical (CVSS v3 Score: 9.8)
+- **Attack Vector:** Network-based
+- **Flaw Type:** Remote Code Execution / Denial of Service / Unauthorized File Access
+
+### Affected Packages
+The vulnerability affects the following packages:
+
+| Package Name | Affected Versions | Fixed Version |
+|--------------|-------------------|---------------|
+| `@react-router/node` | 7.0.0 through 7.9.3 | 7.9.4 or later |
+| `@remix-run/deno` | 2.17.1 and earlier | 2.17.2 or later |
+| `@remix-run/node` | 2.17.1 and earlier | 2.17.2 or later |
+
+### Attack Vector
+The vulnerability exists in the `createFileSessionStorage()` function when used with unsigned cookies. Attackers can manipulate session cookies to force the application to read or write files outside the designated session directory through directory traversal.
+
+## Assessment Results
+
+### Technology Stack Analysis
+This application uses:
+- **Framework:** Next.js (version 16.1.0)
+- **Routing:** Next.js built-in App Router
+- **Session Management:** next-auth (version 4.24.13)
+
+### Dependency Analysis
+A comprehensive analysis of the repository's dependencies was performed:
+
+1. **Direct Dependencies:** No React Router or Remix packages found in `package.json`
+2. **Transitive Dependencies:** No indirect dependencies on vulnerable packages found in `package-lock.json`
+3. **Full Dependency Tree:** Verified using `npm list --all` - no React Router or Remix packages detected
+
+### Verification Commands
+```bash
+# Check for vulnerable packages
+npm list --all 2>&1 | grep -iE "react-router|remix"
+# Result: No React Router or Remix dependencies found
+
+# Check package-lock.json
+cat package-lock.json | jq '.packages | to_entries[] | select(.key | contains("react-router") or contains("remix"))'
+# Result: No matches found
+```
+
+## Conclusion
+
+**This repository is NOT vulnerable to CVE-2025-61686** because:
+
+1. ✅ The application uses Next.js for routing, not React Router or Remix
+2. ✅ None of the vulnerable packages are present as direct dependencies
+3. ✅ None of the vulnerable packages are present as transitive dependencies
+4. ✅ The application does not use `createFileSessionStorage()` function
+
+## Recommendations
+
+While this repository is not affected by this specific vulnerability:
+
+1. **Continue Monitoring:** Keep track of security advisories for all dependencies
+2. **Regular Updates:** Maintain up-to-date dependencies using `npm audit` and `npm update`
+3. **Security Scanning:** Integrate automated security scanning into CI/CD pipeline
+4. **Documentation:** Keep this security assessment updated when major framework changes occur
+
+## References
+
+- [GitHub Security Advisories Database](https://github.com/advisories) - Search for CVE-2025-61686
+- [National Vulnerability Database](https://nvd.nist.gov/) - CVE-2025-61686
+- [React Router GitHub Repository](https://github.com/remix-run/react-router) - Official releases and security patches
+- [Next.js Security Best Practices](https://nextjs.org/docs/app/building-your-application/configuring/security-headers)
+
+---
+
+**Assessed by:** GitHub Copilot Security Analysis  
+**Next Review Date:** As needed when framework dependencies change