Defuddle: XSS via unescaped string interpolation in _findContentBySchemaText image tag

{
  "id": "03b88855e186007ce1d7a9dd71a768b7e2f220b37b2bc13c67f18b6e97625348",
  "url": "https://osv.dev/vulnerability/CVE-2026-30830",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Defuddle: XSS via unescaped string interpolation in _findContentBySchemaText image tag",
    "summary": "Defuddle cleans up HTML pages. Prior to version 0.9.0, the _findContentBySchemaText method in src/defuddle.ts interpolates image src and alt attributes directly into an HTML string without escaping. An attacker can use a \" in the alt attribute to break out of the attribute context and inject event handler. This issue has been patched in version 0.9.0.",
    "evidence": "osv:CVE-2026-30830",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-30830",
      "aliases": [
        "CVE-2026-30830",
        "GHSA-5mq8-78gm-pjmq"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kepano/defuddle",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "440f9e8ca92a7be7871aeb07200190328340dbbf"
                },
                {
                  "fixed": "f154cb740ee603431b69638273af737a27156df9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:kepano:defuddle:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.9.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f154cb740ee603431b69638273af737a27156df9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.8.0",
            "0.7.0",
            "0.6.6",
            "0.6.5",
            "0.6.4",
            "0.6.3",
            "0.6.2",
            "0.6.1",
            "0.6.0",
            "0.5.4",
            "0.5.3",
            "0.5.2",
            "0.5.1",
            "0.5.0",
            "0.4.0",
            "0.3.8",
            "0.3.7",
            "0.3.6",
            "0.3.4",
            "0.3.3",
            "0.3.2",
            "0.3.1",
            "0.3.0",
            "0.2.4",
            "0.2.3",
            "0.2.2",
            "0.2.1",
            "0.2.0",
            "0.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30830.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.436527301Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30830.json",
        "https://github.com/kepano/defuddle/security/advisories/GHSA-5mq8-78gm-pjmq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-30830",
        "https://github.com/kepano/defuddle/commit/f154cb740ee603431b69638273af737a27156df9"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30830.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-30830",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499412,
  "published_at": "2026-03-07T05:49:15.964+00:00"
}