{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-40296",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-40296",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-06T20:48:34.504Z",
    "updatedAt": "2026-05-07T14:03:36.388Z",
    "importedAt": "2026-10-24T01:58:08.712Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "PhpSpreadsheet vulnerable to XSS in HTML writer via custom number format codes",
      "summary": "PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. The HTML writer skips htmlspecialchars escaping when a cell's formatted value differs from the original value. When a cell has a custom number format containing the text placeholder @ along with any additional literal characters (for example \". @\", \"@ \", or \"x@\"), the formatter replaces @ with the cell value and adds the extra characters, causing the formatted value to differ from the original and bypassing HTML escaping entirely. An attacker who can control the cell value and number format of an uploaded spreadsheet that is later converted to HTML and displayed to other users can achieve stored cross-site scripting. This issue is fixed in versions 5.7.0, 3.10.5, 2.4.5, 2.1.16, and 1.30.4.",
      "affected": [
        {
          "vendor": "PHPOffice",
          "product": "PhpSpreadsheet",
          "versions": [
            {
              "version": ">= 4.0.0, <= 5.6.0",
              "status": "affected"
            },
            {
              "version": ">= 3.3.0, <= 3.10.4",
              "status": "affected"
            },
            {
              "version": ">= 2.2.0, <= 2.4.4",
              "status": "affected"
            },
            {
              "version": ">= 2.0.0, <= 2.1.15",
              "status": "affected"
            },
            {
              "version": "<= 1.30.3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}