CVE-2026-108357

{
  "etk_id": "ETK-2026-2476",
  "cve_id": "CVE-2026-108357",
  "display_id": "CVE-2026-108357",
  "ghsa_id": "GHSA-rxj4-h86g-25gc",
  "euvd_id": "EUVD-2026-108242",
  "status": "published",
  "anchor_state": "anchored",
  "title": "XML entity injection in PHPOffice PhpSpreadsheet",
  "summary": "PHPOffice PhpSpreadsheet before 3.10.8 and 5.10.0 can improperly process crafted SpreadsheetML XML containing entity declarations. An attacker who can supply a spreadsheet for processing may cause resource exhaustion and, on PHP versions before 8.0 or when entity substitution is enabled, may access local files or induce server-side requests.",
  "mitigation": "Upgrade PhpSpreadsheet to 3.10.8 or 5.10.0. Until upgraded, do not process untrusted SpreadsheetML files and avoid enabling libxml entity substitution.",
  "vendor": "PHPOffice",
  "product": "PhpSpreadsheet",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=4.0.0, <= 5.9.0"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "5.10.0"
      ],
      "package_name": "phpoffice/phpspreadsheet",
      "purl": "pkg:composer/phpoffice/phpspreadsheet"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.3.0, <= 3.10.7"
      ],
      "ecosystem": "composer",
      "fixed_versions": [
        "3.10.8"
      ],
      "package_name": "phpoffice/phpspreadsheet",
      "purl": "pkg:composer/phpoffice/phpspreadsheet"
    }
  ],
  "cwes": [
    611
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 10.866333,
  "t0_at": "2026-10-22T17:38:16.098000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-22T18:18:51.529329+00:00",
      "days": 0.028187862604166666,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T17:38:16.098000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-12T20:54:40+00:00",
      "days": -9.863612245370371,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T17:38:16.098000+00:00",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-rxj4-h86g-25gc"
    },
    "trigger_signal": {
      "at": "2026-10-22T17:38:16.098000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T17:38:16.098000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-108357"
    }
  }
}