CVE-2026-104269

{
  "etk_id": "ETK-2026-3646",
  "cve_id": "CVE-2026-104269",
  "display_id": "CVE-2026-104269",
  "ghsa_id": "GHSA-5pww-8rfg-9crf",
  "euvd_id": "EUVD-2026-117555",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Multipart filename validation bypass in ModSecurity",
  "summary": "ModSecurity versions 3.0.0 through 3.0.16 can evaluate an uploaded multipart filename differently from the backend application. An attacker may evade filename-based WAF policy when the backend honors RFC 2231 filename* values and uses the resulting name for security-relevant processing; PHP's native multipart parser is not affected by this mismatch.",
  "mitigation": "Upgrade ModSecurity to version 3.0.17 or later. Until the upgrade is complete, limit multipart uploads and enforce filename validation in the backend application.",
  "vendor": "owasp-modsecurity",
  "product": "ModSecurity",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "ModSecurity",
      "purl": null
    }
  ],
  "cwes": [
    436
  ],
  "cvss_score": 8.6,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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": 15.452518166666668,
  "t0_at": "2026-11-05T15:51:18.332000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-09-30T07:36:33+00:00",
      "days": -36.34358023148148,
      "is_lower_bound": false,
      "measured_at": "2026-11-05T15:51:18.332000+00:00",
      "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-5pww-8rfg-9crf"
    },
    "trigger_signal": {
      "at": "2026-11-05T15:51:18.332000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-05T15:51:18.332000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-104269"
    }
  }
}