DOMSanitizer - Incomplete data: URL Sanitization in DOMSanitizer::isDangerousUrl() Allows Base64-Encoded Payloads to Bypass href and xlink:href Validation

{
  "id": "82d6d78c5e7cf1241839a3eccecbfb228bd60a366385109834a8c77507f72914",
  "url": "https://osv.dev/vulnerability/CVE-2026-100370",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DOMSanitizer - Incomplete data: URL Sanitization in DOMSanitizer::isDangerousUrl() Allows Base64-Encoded Payloads to Bypass href and xlink:href Validation",
    "summary": "DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.15, the isDangerousUrl() method is responsible for rejecting dangerous URL values in the href and xlink:href attributes. The weakness is that \"javascript:\" is rejected as a scheme, while \"data:\" is rejected only when the literal substring onload appears in the URL value (/^data:.*onload/i). Because data: payloads are routinely Base64-encoded, the dangerous content (",
    "evidence": "osv:CVE-2026-100370",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100370",
      "aliases": [
        "CVE-2026-100370",
        "GHSA-wcj2-r6vg-rm97"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rhukster/dom-sanitizer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "10f97807e4501d60f63987f2e76a38cdbf312dcb"
                },
                {
                  "fixed": "fb8f758b41134fc5fb2f563666f2330c69e31f94"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.15"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "10f97807e4501d60f63987f2e76a38cdbf312dcb"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "fb8f758b41134fc5fb2f563666f2330c69e31f94"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "10f97807e4501d60f63987f2e76a38cdbf312dcb"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.0.15"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.0.14",
            "1",
            "1.0.13",
            "1.0.12",
            "1.0.11",
            "1.0.10",
            "1.0.9",
            "1.0.8",
            "1.0.7",
            "1.0.6",
            "1.0.5",
            "1.0.4",
            "1.0.3",
            "1.0.2",
            "1.0.1",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100370.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.207741289Z",
      "provider": "osv",
      "references": [
        "https://github.com/rhukster/dom-sanitizer/releases/tag/1.0.15",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100370.json",
        "https://github.com/rhukster/dom-sanitizer/security/advisories/GHSA-wcj2-r6vg-rm97",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100370",
        "https://github.com/rhukster/dom-sanitizer/commit/10f97807e4501d60f63987f2e76a38cdbf312dcb",
        "https://github.com/rhukster/dom-sanitizer/commit/fb8f758b41134fc5fb2f563666f2330c69e31f94"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100370.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100370",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505681,
  "published_at": "2026-09-28T20:07:09.47+00:00"
}