When an outbound request made by the Go HTTP client fails, the `html.ServerError` is returned unescaped without the expected Content Security Policy header added to valid responses.
By creating an RSS feed item with the inline description containing an `<img>` tag with a `srcset` attribute pointing to an invalid URL like `http:a<script>alert(1)</script>`, we can coerce the proxy handler into an error condition where the invalid URL is returned unescaped and in full.
This results in JavaScript execution on the Miniflux instance as soon as the user is convinced (e.g. by a message in the alt text) to open the broken image.
An attacker can execute arbitrary JavaScript in the context of a victim Miniflux user when they open a broken image in a crafted RSS feed. This can be used to perform actions on the Miniflux instance as that user and gain administrative access to the Miniflux instance if it is reachable and the victim is an administrator.
A patch is available in version 2.0.43. As a workaround sisable image proxy; default value is `http-only`.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
Sign in to view the affected projects.
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2023-31334 | Stored XSS in Miniflux when opening a broken image due to unescaped ServerError in proxy handler |
Github GHSA |
GHSA-mqqg-xjhj-wfgw | Stored XSS in Miniflux when opening a broken image due to unescaped ServerError in proxy handler |
Tue, 25 Feb 2025 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-02-25T14:53:55.753Z
Reserved: 2023-03-04T01:03:53.635Z
Link: CVE-2023-27592
Updated: 2024-08-02T12:16:35.842Z
Status : Modified
Published: 2023-03-17T20:15:13.283
Modified: 2024-11-21T07:53:13.093
Link: CVE-2023-27592
No data.
OpenCVE Enrichment
No data.
EUVD
Github GHSA