Miniflux is a feed reader. Since v2.0.25, Miniflux will automatically proxy images served over HTTP to prevent mixed content errors. 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`.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Miniflux is a feed reader. Since v2.0.25, Miniflux will automatically proxy images served over HTTP to
    prevent mixed content errors. 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`. (CVE-2023-27592)

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Miniflux is a feed reader. Prior to version 2.0.43, an unauthenticated user can retrieve Prometheus
    metrics from a publicly reachable Miniflux instance where the `METRICS_COLLECTOR` configuration option is
    enabled and `METRICS_ALLOWED_NETWORKS` is set to `127.0.0.1/8` (the default). A patch is available in
    Miniflux 2.0.43. As a workaround, set `METRICS_COLLECTOR` to `false` (default) or run Miniflux behind a
    trusted reverse-proxy. (CVE-2023-27591)

  - Miniflux is a feed reader. Since v2.0.25, Miniflux will automatically proxy images served over HTTP to
    prevent mixed content errors. 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`. (CVE-2023-27592)

ID	Name	Product	Family	Severity
434628	SCA: security update for miniflux.app/v2 (GHSA-mqqg-xjhj-wfgw)	Tenable Cloud Security	SCA Checks	medium
434628	SCA: security update for miniflux.app/v2 (GHSA-mqqg-xjhj-wfgw)	Tenable Self-Hosted Container Security	SCA Checks	medium
405587	Alpine: multiple miniflux packages: security update to 2.0.43-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
405587	Alpine: multiple miniflux packages: security update to 2.0.43-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high

Detections

Analytics

CVE-2023-27592

medium

Tenable Plugins

medium

medium

high

high