GitHub Advisoryadvisory · Go
GHSA-cq88-842x-2jhp Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration
MEDIUM
Official page ↗
- Aliases
- CVE-2025-31483
- Ecosystem
- Go
- Packages
- miniflux.app/v2
- Severity
- Moderate
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Weaknesses
- CWE-79
- Reviewed
- 2025-04-04
Affected packages
• Go miniflux.app/v2: < 2.2.7 → fixed in 2.2.7
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
Related
Alias · CVE (1)
- CVE-2025-31483 Miniflux is a feed reader. vulnerability
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness