Path Traversal in Flintsh Flare
CVE-2026-30942
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (44.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Flintsh Flare — versions < 1.7.3
Weakness classification (CWE)
References
- github.com/FlintSH/Flare/security/advisories/GHSA-h639-p7m9-mpgp (Exploit, Mitigation, Vendor Advisory)
- github.com/FlintSH/Flare/commit/cd894cc480619aef958be5de72b1445222fd8d36 (Patch)
- github.com/FlintSH/Flare/releases/tag/v1.7.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30942?
- CVE-2026-30942 is a medium-severity vulnerability in Flintsh Flare, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-03-10.
- How severe is CVE-2026-30942?
- Medium severity. CVSS v3 base score is 6.5 out of 10.