justhtml before 3.11.0 XSS via selectedcontent projection

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-74793",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-08-23T13:34:11.936Z",
    "dateReserved": "2026-08-16T12:59:42.222Z",
    "datePublished": "2026-08-23T13:34:11.936Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-08-23T13:34:11.936Z"
      },
      "datePublic": "2026-08-06T00:00:00.000Z",
      "title": "justhtml before 3.11.0 XSS via selectedcontent projection",
      "descriptions": [
        {
          "lang": "en",
          "value": "justhtml before 3.11.0 contains a cross-site scripting vulnerability where the default sanitizer bypasses event handler removal in selectedcontent projections. Attackers can inject SVG or MathML elements with event handlers that are cloned and reinserted into output without sanitization, enabling stored or reflected XSS attacks."
        }
      ],
      "affected": [
        {
          "vendor": "EmilStenstrom",
          "product": "justhtml",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.11.0"
            },
            {
              "version": "3.11.0",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
              "cweId": "CWE-79",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-gjf2-f4jc-69xf",
          "name": "GitHub Security Advisory (GHSA-gjf2-f4jc-69xf)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/justhtml-before-xss-via-selectedcontent-projection",
          "name": "VulnCheck Advisory: justhtml before 3.11.0 XSS via selectedcontent projection",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "CHANGED",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM"
          }
        }
      ]
    }
  }
}