Unauthenticated Miniflux user can bypass allowed networks check to obtain Prometheus metrics

published 2023-03-17 3 y ago modified 2026-09-10 1 mo ago also GHSA-3qjf-qh38-x73v , EUVD-2023-31333

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 1 links 2

go miniflux.app/v2 2.0.43
miniflux_project miniflux 2.0.43

miniflux Alpine 3.17 2.0.43-r0

alpine advisories ALPINE-CVE-2023-27591

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/miniflux/v2#1745 pull request
github.com/miniflux/v2/releases/tag/2.0.43 release

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 20 mo ago (2025-02-25)

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	miniflux.app/v2	<2.0.43	2.0.43
go	miniflux.app	<=1.0.46	no fix listed

Affected products

miniflux v2

Classification

Weakness

CWE-1220 Insufficient Granularity of Access Control
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

github.com /miniflux/v2/pull/1745
web, issue-tracking, patch
github.com /miniflux/v2/security/advisories/GHSA-3qjf-qh38-x73v
web, vendor-advisory
github.com /miniflux/v2/releases/tag/2.0.43
web, release-notes
miniflux.app /docs/configuration.html#metrics-collector
web, product
nvd.nist.gov /vuln/detail/CVE-2023-27591
advisory
github.com /miniflux/v2
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary