GHSA-cq88-842x-2jhpMedium

Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration

Published
April 4, 2025
Last Modified
April 7, 2025

🔗 CVE IDs covered (1)

CVE-2025-31483 →

📋 Description

Summary

Due to a weak Content Security Policy on the /proxy/* route, an attacker can bypass the CSP of the media proxy and execute cross-site scripting when opening external images in a new tab/window.

Impact

A malicious feed added to Miniflux can execute arbitrary JavaScript in the user's browser when opening external resources, such as proxified images, in a new tab or window.

Mitigation

The CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;.

Upgrade to Miniflux >= 2.2.7

Credit

RyotaK (GMO Flatt Security Inc.) with takumi-san.ai

🎯 Affected products1

  • go/miniflux.app/v2:< 2.2.7

🔗 References (4)