---
id: CVE-2023-27591
aliases:
  - GHSA-3qjf-qh38-x73v
title: >-
  Unauthenticated Miniflux user can bypass allowed networks check to obtain
  Prometheus metrics
summary: >-
  Unauthenticated Miniflux user can bypass allowed networks check to obtain
  Prometheus metrics
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
vendor: v2
product: miniflux.app/v2
ecosystem: go
affected:
  - miniflux.app/v2 < 2.0.43
  - miniflux.app <= 1.0.46
patched:
  - miniflux.app/v2 2.0.43
published: '2025-04-02'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:57.049458040Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-3qjf-qh38-x73v'
references:
  - url: 'https://github.com/miniflux/v2/security/advisories/GHSA-3qjf-qh38-x73v'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-27591'
  - url: 'https://github.com/miniflux/v2/pull/1745'
  - url: 'https://github.com/miniflux/v2'
  - url: 'https://github.com/miniflux/v2/releases/tag/2.0.43'
  - url: 'https://miniflux.app/docs/configuration.html#metrics-collector'
tags:
  - osv
  - go
epss: 0.00755
epssPercentile: 0.53142
ingestedAt: '2026-09-12T03:13:01.749Z'
---

## Overview

### Impact

An unauthenticated user can retrieve Prometheus metrics from a publicly reachable Miniflux instance where the `METRICS_COLLECTOR` [configuration option](https://miniflux.app/docs/configuration.html#metrics-collector) is enabled and `METRICS_ALLOWED_NETWORKS` is set to `127.0.0.1/8` (the default).

### Patches

PR #1745 fixes the problem. Available in Miniflux >= 2.0.43.

### Workarounds

Set `METRICS_COLLECTOR` to `false` (default) or run Miniflux behind a trusted reverse-proxy.

### References

- https://miniflux.app/docs/configuration.html#metrics-collector
- https://miniflux.app/docs/configuration.html#metrics-allowed-networks

## Affected packages

- `miniflux.app/v2 < 2.0.43`
- `miniflux.app <= 1.0.46`

## Remediation

Upgrade to a patched release:

- `miniflux.app/v2 2.0.43`