CVE-2026-109515

{
  "etk_id": "ETK-2026-1756",
  "cve_id": "CVE-2026-109515",
  "display_id": "CVE-2026-109515",
  "ghsa_id": "GHSA-f6hj-w62g-r97p",
  "euvd_id": "EUVD-2026-102644",
  "status": "published",
  "anchor_state": "anchored",
  "title": "MailOptin privilege escalation in registration forms",
  "summary": "MailOptin for WordPress through version 1.2.78.6 allows unauthenticated attackers to modify existing WordPress user accounts, potentially including administrator accounts. Exposure requires a published WordPress User Registration opt-in form.",
  "mitigation": "Disable or unpublish WordPress User Registration opt-in forms, or deactivate MailOptin, until a vendor-fixed release is confirmed. Review WordPress user accounts and reset credentials for accounts that may have been exposed.",
  "vendor": "properfraction",
  "product": "MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, <= 1.2.78.6"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "MailOptin – Popup, Optin Forms & Email Newsletters for Mailchimp, HubSpot, AWeber Etc.",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 9.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0044,
  "epss_percentile": 0.3685,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 42.26696786666667,
  "t0_at": "2026-10-16T04:27:01.480000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-16T08:16:33.300421+00:00",
      "days": 0.1593960696875,
      "is_lower_bound": false,
      "measured_at": "2026-10-16T04:27:01.480000+00:00",
      "url": null
    },
    "kev": {
      "at": "2026-10-16T00:00:00+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-16T04:27:01.480000+00:00",
      "precision": "day",
      "url": "https://vulncheck.com/cve/CVE-2026-109515"
    },
    "trigger_signal": {
      "at": "2026-10-16T04:27:01.480000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-16T04:27:01.480000+00:00",
      "url": "https://github.com/advisories/GHSA-f6hj-w62g-r97p"
    }
  }
}