CVE-2026-18391

{
  "etk_id": "ETK-2026-1521",
  "cve_id": "CVE-2026-18391",
  "display_id": "CVE-2026-18391",
  "ghsa_id": "GHSA-5736-34m2-3cxc",
  "euvd_id": "EUVD-2026-57100",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthenticated PHP object injection in WooCommerce Subscriptions",
  "summary": "WooCommerce Subscriptions versions before 9.1.0 are affected by unsafe deserialization when High-Performance Order Storage is enabled. An unauthenticated attacker may leverage the resulting PHP object injection to execute code if a usable gadget chain is present in bundled dependencies.",
  "mitigation": "Upgrade WooCommerce Subscriptions to version 9.1.0 or later. Until the upgrade is complete, disable High-Performance Order Storage to reduce exposure.",
  "vendor": null,
  "product": "WooCommerce Subscriptions",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.7.0, < 9.1.0"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "9.1.0"
      ],
      "package_name": "WooCommerce Subscriptions",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 9.8,
  "cvss_src": "other",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0096,
  "epss_percentile": 0.6108,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 76.09184888333333,
  "t0_at": "2026-08-12T06:00:17.487000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-14T03:32:22.970448+00:00",
      "days": 62.897285688055554,
      "is_lower_bound": false,
      "measured_at": "2026-08-12T06:00:17.487000+00:00",
      "url": null
    },
    "kev": {
      "at": "2026-10-13T00:00:00+00:00",
      "days": 62,
      "is_lower_bound": false,
      "measured_at": "2026-08-12T06:00:17.487000+00:00",
      "precision": "day",
      "url": "https://vulncheck.com/cve/CVE-2026-18391"
    },
    "trigger_signal": {
      "at": "2026-10-13T00:00:00+00:00",
      "days": 61.749797604166666,
      "is_lower_bound": false,
      "measured_at": "2026-08-12T06:00:17.487000+00:00",
      "url": "https://vulncheck.com/cve/CVE-2026-18391"
    }
  }
}