CVE-2026-126081

{
  "etk_id": "ETK-2026-3519",
  "cve_id": "CVE-2026-126081",
  "display_id": "CVE-2026-126081",
  "ghsa_id": "GHSA-wm3x-v3qw-4jh3",
  "euvd_id": "EUVD-2026-122932",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Mass-assignment authorization bypass in Action Pack",
  "summary": "Affected Action Pack versions can lose strong-parameter protections when application code uses the return value of block-form `ActionController::Parameters#each_key` for mass assignment. A remote unauthenticated attacker may set attributes that the application intended to restrict, but only where the application follows that usage pattern.",
  "mitigation": "Upgrade Action Pack to 8.0.5.2 or 8.1.4.1. Until upgraded, do not pass the return value of `each_key` to mass-assignment methods; pass the permitted parameters object instead.",
  "vendor": "rubygems",
  "product": "rubygems:actionpack",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.1, < 8.1.4.1"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.1.4.1"
      ],
      "package_name": "actionpack",
      "purl": "pkg:gem/actionpack"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 8.0.5.2"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.0.5.2"
      ],
      "package_name": "actionpack",
      "purl": "pkg:gem/actionpack"
    }
  ],
  "cwes": [
    915
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 6.7948839,
  "t0_at": "2026-11-10T21:06:31.425000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-04T03:02:14+00:00",
      "days": -6.752979456018519,
      "is_lower_bound": false,
      "measured_at": "2026-11-10T21:06:31.425000+00:00",
      "url": "https://github.com/rails/rails/security/advisories/GHSA-wm3x-v3qw-4jh3"
    }
  }
}