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Medium, CVSS 4.8

Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration

CVE-2025-31483GHSA-cq88-842x-2jhp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (miniflux.app/v2 2.2.7), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
4.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N · score source
EPSS
  • CVE-2025-31483: 0.43% estimated exploitation activity in the next 30 days; percentile 36.90 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Due to a weak Content Security Policy on the /proxy/ route, an attacker can bypass the CSP of the media proxy and execute cross-site scripting when opening external images in a new tab/window. Impact A malicious feed added to Miniflux can execute arbitrary JavaScript in the user's browser when opening external resources, such as proxified images, in a new tab or window. Mitigation The CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;. Upgrade to Miniflux = 2.2.7 Credit RyotaK (GMO Flatt Security Inc.) with takumi-san.ai

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-cq88-842x-2jhp

Agent brief

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# Patch Next advisory brief: CVE-2025-31483

Advisory: Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration
IDs: CVE-2025-31483, GHSA-cq88-842x-2jhp
Record: https://patchnext.com/advisories/cve-2025-31483 (revision 1, source checked 26 Oct 2026, 15:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: miniflux.app/v2 2.2.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go miniflux.app/v2: affected < 2.2.7; fixed in 2.2.7

## Suggested inspection (read-only)
- Go miniflux.app/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on miniflux.app/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-cq88-842x-2jhp (GitHub-reviewed advisory GHSA-cq88-842x-2jhp lists affected ranges: Go miniflux.app/v2 >=0 <2.2.7)

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