{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.4.7"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ca30f070c360df162a3e3848e80e6fd3c9e74bff"
            },
            {
              "fixed": "7996f1dc78eb8b7922388aed75d94a9f8fad9a36"
            }
          ],
          "repo": "https://github.com/cure53/dompurify",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-76mc-f452-cxcm"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-501"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65902.json"
  },
  "details": "DOMPurify before 3.4.7 (affected versions \u003c= 3.4.5) passes direct references to the module-level DEFAULT_ALLOWED_TAGS and DEFAULT_ALLOWED_ATTR sets to the uponSanitizeElement and uponSanitizeAttribute hooks via data.allowedTags / data.allowedAttributes when sanitize is called without an explicit cfg.ALLOWED_TAGS / cfg.ALLOWED_ATTR array. A hook that mutates these fields permanently widens the default allow-lists for the lifetime of the DOMPurify instance, so all subsequent default-config sanitize calls inherit the widened defaults and attacker payloads using the poisoned tag/attribute name survive sanitization. removeAllHooks(), clearConfig(), and passing a fresh cfg do not recover the state; only constructing a new DOMPurify instance does.",
  "id": "CVE-2026-65902",
  "modified": "2026-07-25T03:56:30.202952830Z",
  "published": "2026-07-23T13:16:20.528Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65902.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-76mc-f452-cxcm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65902"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/dompurify-before-hook-mutation-pollution-via-allowedtags"
    },
    {
      "type": "FIX",
      "url": "https://github.com/cure53/DOMPurify/commit/7996f1dc78eb8b7922388aed75d94a9f8fad9a36"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags"
}