Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

CVE-2026-30942Flare has a Path Traversal in /api/avatars/[filename]

High 8.3

In plain English

A high-severity path traversal in Flare from FlintSH. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 4.0)8.3High

Exploit odds (30 days)0.7%top 46.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
FlintSH	Flare	< 1.7.3

Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

References

https://github.com/FlintSH/Flare/security/advisories/GHSA-h639-p7m9-mpgp x_refsource_CONFIRM
https://github.com/FlintSH/Flare/commit/cd894cc480619aef958be5de72b1445222fd8d36 x_refsource_MISC
https://github.com/FlintSH/Flare/releases/tag/v1.7.3 x_refsource_MISC