What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-17 · updated 2026-06-17
• Weakness: CWE-200

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.

Affected products

• miniflux: before 2.0.43 — fixed in 2.0.43

How to fix

Upgrade to a fixed version: miniflux 2.0.43. Check the vendor advisory for mitigations.

References

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

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