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EUVD-2026-226975

fkie_cve-2025-31483

Miniflux is a feed reader. 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. To mitigate the vulnerability, the CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;. This vulnerability is fixed in 2.2.7.

GHSA-cq88-842x-2jhp — Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration

Affected: Go: miniflux.app/v2

## 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](https://ryotak.net) (GMO Flatt Security Inc.) with [takumi-san.ai](https://takumi-san.ai)

openSUSE-SU-2025:14982-1 — govulncheck-vulndb-0.0.20250409T170536-1.1 on GA media

govulncheck-vulndb-0.0.20250409T170536-1.1 on GA media

UBUNTU-CVE-2025-31483

Affected: Ubuntu:Pro:24.04:LTS: miniflux, Ubuntu:25.10: miniflux, Ubuntu:Pro:26.04:LTS: miniflux