{
  "id": "CVE-2026-21514",
  "url": "https://spydr.io/cve/CVE-2026-21514",
  "published": "2026-02-10T18:16:33.803Z",
  "modified": "2026-06-17T10:18:45.733Z",
  "score": 7.8,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "score_source": "microsoft.com",
  "epss": 0.01578,
  "epss_percentile": 0.74639,
  "exploited": true,
  "kev": {
    "added": "2026-02-10",
    "due": "2026-03-03",
    "action": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
    "ransomware": "Unknown",
    "name": "Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability",
    "notes": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21514"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "Microsoft"
  ],
  "products": [
    "Microsoft 365 Apps for Enterprise",
    "Microsoft Office LTSC 2021",
    "Microsoft Office LTSC 2024",
    "Microsoft Office LTSC for Mac 2021",
    "Microsoft Office LTSC for Mac 2024"
  ],
  "cwes": [
    "CWE-807"
  ],
  "description": "Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 7.8,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21514",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21514",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}