CVE-2026-30942: Flintsh Flare

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Flare is a Next.js-based, self-hostable file sharing platform that integrates with screenshot tools. Prior to 1.7.3, an authenticated path traversal vulnerability in /api/avatars/[filename] allows any logged-in user to read arbitrary files from within the application container. The filename URL parameter is passed to path.join() without sanitization, and getFileStream() performs no path validation, enabling %2F-encoded ../ sequences to escape the uploads/avatars/ directory and read any file accessible to the nextjs process under /app/. Authentication is enforced by Next.js middleware. However, on instances with open registration enabled (the default), any attacker can self-register and immediately exploit this. This vulnerability is fixed in 1.7.3.

Affected products

• Flintsh Flare: before 1.7.3 (fixed in 1.7.3)

Published 2026-03-10. Last modified 2026-06-17.