enshrined/svg-sanitize: Stored XSS via DTD Entity / HTML5 Named Character Reference Collision

{
  "id": "4a555c3a0f0b14d4b3f5c980f43721ab37f88a80c3bf37e4e8cce0572892ed2f",
  "url": "https://osv.dev/vulnerability/CVE-2026-107380",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "enshrined/svg-sanitize: Stored XSS via DTD Entity / HTML5 Named Character Reference Collision",
    "summary": "savg-sanitizer is a PHP SVG/XML sanitizer. Prior to 1.0.0, svg-sanitizer's isHrefSafeValue() validates an SVG href after XML DTD entity expansion, but saveXML() serializes the original entity reference after removing the DTD declaration. A crafted entity such as Tab can appear to the sanitizer as a safe fragment prefix while HTML5 Named Character Reference resolution during inline HTML rendering later converts the surviving reference to whitespace, exposing a javascript: URL. When an application embeds the sanitized SVG inline, a user who activates the link can cause script to execute in the embedding page's origin. This issue is fixed in version 1.0.0.",
    "evidence": "osv:CVE-2026-107380",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-107380",
      "aliases": [
        "CVE-2026-107380",
        "GHSA-9rjx-3jch-6vjf"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/darylldoyle/svg-sanitizer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f3300fcd1bbf67d205b52217c75d0f7d6a8c47ff"
                },
                {
                  "fixed": "23877db7e76f1e1df5c3e65ab30239219c3d2867"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "23877db7e76f1e1df5c3e65ab30239219c3d2867"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f3300fcd1bbf67d205b52217c75d0f7d6a8c47ff"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.0.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.22.0",
            "0.21.0",
            "0.20.0",
            "0.19.0",
            "0.18.0",
            "0.17.0",
            "0.16.0",
            "0.15.4",
            "0.15.3",
            "0.15.2",
            "0.15.1",
            "0.15.0",
            "0.14.1",
            "0.14.0",
            "0.13.3",
            "0.13.2",
            "0.10.0",
            "0.9.2",
            "0.9.1",
            "0.9.0",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.7.2",
            "0.7.1",
            "0.7.0",
            "0.6.0",
            "0.5.3.1",
            "0.5.3",
            "0.5.2",
            "0.5.1",
            "0.5.0",
            "0.4.1",
            "0.4.0",
            "0.3.0",
            "0.2.1",
            "0.2.0",
            "0.1.6",
            "0.1.5",
            "0.1.4",
            "0.1.3",
            "0.1.2",
            "0.1.1",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107380.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.447383132Z",
      "provider": "osv",
      "references": [
        "https://github.com/darylldoyle/svg-sanitizer/releases/tag/1.0.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107380.json",
        "https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-9rjx-3jch-6vjf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-107380",
        "https://github.com/darylldoyle/svg-sanitizer/commit/23877db7e76f1e1df5c3e65ab30239219c3d2867"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107380.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-107380",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521244,
  "published_at": "2026-10-08T18:06:14.107+00:00"
}