{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.4.0"
              },
              {
                "fixed": "3.3.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5b16e0b892e82b1779d62b9928b43c4c4ff290b9"
            }
          ],
          "repo": "https://github.com/cure53/dompurify",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-9p3w-6h5p-cv75"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65911.json"
  },
  "details": "In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version.",
  "id": "CVE-2026-65911",
  "modified": "2026-07-28T03:56:04.186786483Z",
  "published": "2026-07-23T13:16:22.748Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65911.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-9p3w-6h5p-cv75"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65911"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/dompurify-before-xss-via-add-attr-add-tags-state-leakage"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage"
}