CVE-2025-31483: Miniflux.app/v2 Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-cq88-842x-2jhp
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CWE-79
Published
Advisory Summary

CVE-2025-31483 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Miniflux.app/v2 libraries in the Go ecosystem. The issue involves miniflux media proxy vulnerable to stored cross-site scripting due to improper content-security-policy configuration. Remediation is available by upgrading affected packages to version 2.2.7.

CVE-2025-31483 at a Glance

CVE Identifier CVE-2025-31483
GHSA Identifier GHSA-cq88-842x-2jhp
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Miniflux.app/v2
Package Ecosystem Go
Published Date
Last Updated

How to Fix CVE-2025-31483

To remediate this vulnerability, upgrade all affected Miniflux.app/v2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

miniflux.app/v2 fixed: 2.2.7 
Upgrade miniflux.app/v2 to 2.2.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for miniflux.app/v2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-31483, inspect your project dependencies for Miniflux.app/v2:

inspect dependencies for miniflux.app/v2

Analyze the terminal output to locate any version of Miniflux.app/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.7), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Miniflux.app/v2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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](https://ryotak.net) (GMO Flatt Security Inc.) with [takumi-san.ai](https://takumi-san.ai)

CVE-2025-31483 Affected Miniflux.app/v2 Versions

1 component(s)
Fixed Versions:
2.2.7
Product / Package Ecosystem Affected Versions Fixed Version
miniflux.app/v2
golang/miniflux.app/v2
Go
< 2.2.7
2.2.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/miniflux/v2/security/advisories/GHSA-cq88-842x-2jhp
NVD — CVE-2025-31483 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-31483
Security Fix Commit FIX COMMIT
https://github.com/miniflux/v2/commit/cb695e653a08af4cabcb277c271ce74bd0c746e6
Miniflux.app/v2 Source Repository REPOSITORY
https://github.com/miniflux/v2

Frequently Asked Questions

What is CVE-2025-31483?
CVE-2025-31483 is a security vulnerability in Miniflux.app/v2 involving Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Miniflux.app/v2 versions are affected?
Affected versions include releases prior to 2.2.7 across affected packages: miniflux.app/v2.
What version fixes CVE-2025-31483?
Upgrading to 2.2.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is miniflux.app/v2 affected?
Yes, miniflux.app/v2 is affected in releases prior to 2.2.7. Upgrade your dependency to 2.2.7 or later.
What CWE is associated with CVE-2025-31483?
CVE-2025-31483 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Go dependencies for CVE-2025-31483?
Run the dependency tree command: 'inspect dependencies for miniflux.app/v2'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cq88-842x-2jhp",
  "modified" : "2025-04-07T19:52:04Z",
  "published" : "2025-04-04T14:09:40Z",
  "aliases" : [ "CVE-2025-31483" ],
  "summary" : "Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration",
  "details" : "## Summary\n\nDue 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.\n\n## Impact\n\nA 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.\n\n## Mitigation\n\nThe CSP for the media proxy has been changed from `default-src 'self'` to `default-src 'none'; form-action 'none'; sandbox;`.\n\nUpgrade to Miniflux >= 2.2.7\n\n## Credit\n[RyotaK](https://ryotak.net) (GMO Flatt Security Inc.) with [takumi-san.ai](https://takumi-san.ai)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "miniflux.app/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.2.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/miniflux/v2/security/advisories/GHSA-cq88-842x-2jhp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-31483"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/miniflux/v2/commit/cb695e653a08af4cabcb277c271ce74bd0c746e6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/miniflux/v2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-04-04T14:09:40Z",
    "nvd_published_at" : "2025-04-03T18:15:47Z"
  }
}