GHSA-cq88-842x-2jhp
Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Go | miniflux.app/v2 | < 2.2.7 | 2.2.7 |
Details
As written in the advisory (Markdown source, shown as plain text).
## 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)
References
External links from the advisory. They lead to third-party sites.