Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed

{
  "id": "094c3f0c4bf67651491f3a1800f4ddf014c82d168d52eb84df6012d74ff7e155",
  "url": "https://osv.dev/vulnerability/CVE-2026-103277",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Ghost 2.5.0 before 6.34.0 Untrusted Script Execution via oEmbed",
    "summary": "Ghost versions from 2.5.0 before 6.34.0 contain an untrusted script execution vulnerability in the oEmbed preview feature that fails to sandbox externally hosted scripts. Attackers can craft malicious oEmbed content to execute scripts in the context of a staff user's admin session, potentially compromising administrative access.",
    "evidence": "osv:CVE-2026-103277",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-103277",
      "aliases": [
        "BIT-ghost-2026-103277",
        "CVE-2026-103277",
        "GHSA-8vhf-xxpj-4qrg"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tryghost/ghost",
              "type": "GIT",
              "events": [
                {
                  "introduced": "41b23dceb7aa1166e8e05bdd61a066eee6e4aec3"
                },
                {
                  "fixed": "10da09186253d7be24698d3a5512c7f9cbea13a4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "fixed": "6.34.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2.5.0"
                      },
                      {
                        "fixed": "6.34.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103277.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.270082802Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103277.json",
        "https://github.com/TryGhost/Ghost/security/advisories/GHSA-8vhf-xxpj-4qrg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-103277",
        "https://www.vulncheck.com/advisories/ghost-2.5.0-before-6.34.0-untrusted-script-execution-via-oembed"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103277.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-103277",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508999,
  "published_at": "2026-10-01T10:42:14.602+00:00"
}