Silverstripe Framework: Possible XSS attack through media embed

{
  "id": "6552f6339a0c3456af0dd401842cedce3ffb0563e493d23a77365d867fc12489",
  "url": "https://osv.dev/vulnerability/CVE-2026-54720",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Silverstripe Framework: Possible XSS attack through media embed",
    "summary": "Silverstripe Framework is a PHP framework which powers the Silverstripe CMS. In versions prior to 6.2.2, the \"Insert media from web\" functionality in the CMS is vulnerable to XSS from a specially crafted embed. This issue was fixed in version 6.2.2/",
    "evidence": "osv:CVE-2026-54720",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-54720",
      "aliases": [
        "CVE-2026-54720",
        "GHSA-gvrw-qqp5-jgc5"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/silverstripe/silverstripe-framework",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1bcb02adfc365c6436dc26ab2f6dd32d97f3979b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.2.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "6.2.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.2.1",
            "6.2.0-rc1",
            "6.2.0",
            "6.2.0-beta1",
            "6.1.0-beta1",
            "6.0.0-alpha1",
            "5.1.0-beta1",
            "5.0.0-beta1",
            "5.0.0-alpha1",
            "4.9.0-beta1",
            "4.9.0-alpha1",
            "4.8.0-beta1",
            "4.7.0-beta1",
            "4.6.0-beta1",
            "4.1.0-rc1",
            "4.0.0-beta3",
            "4.0.0-beta2",
            "4.0.0-beta1",
            "4.0.0-alpha7",
            "4.0.0-alpha6",
            "4.0.0-alpha4",
            "4.0.0-alpha3",
            "4.0.0-alpha2",
            "4.0.0-alpha1",
            "3.0.0-rc1",
            "3.0.0-beta3",
            "3.0.0-beta2",
            "3.0.0-beta1",
            "3.0.0-alpha2",
            "3.0.0-alpha1",
            "2.2.2-rc1",
            "2.3.0-rc1",
            "2.2.0-rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54720.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.137044955Z",
      "provider": "osv",
      "references": [
        "https://www.silverstripe.org/download/security-releases/cve-2026-54720",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54720.json",
        "https://github.com/silverstripe/silverstripe-framework/security/advisories/GHSA-gvrw-qqp5-jgc5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54720"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54720.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54720",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494917,
  "published_at": "2026-07-01T21:02:59.522+00:00"
}