Strapi 4.x through 4.26.2 and 5.x before 5.48.1 Stored XSS via WYSIWYG

{
  "id": "d5f7d3758e360c0c24b292c767c15c220aecf99559c10d7123a4b83f911fa763",
  "url": "https://osv.dev/vulnerability/CVE-2026-90561",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Strapi 4.x through 4.26.2 and 5.x before 5.48.1 Stored XSS via WYSIWYG",
    "summary": "Strapi versions 4.x through 4.26.2 and 5.x before 5.48.1 contain a stored cross-site scripting vulnerability in the content manager WYSIWYG preview component that fails to strip script tags from rich text. An Author-role user can store malicious script tags in rich text fields that execute in an Editor or Super Admin's session when the preview pane is expanded, enabling account takeover.",
    "evidence": "osv:CVE-2026-90561",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-90561",
      "aliases": [
        "CVE-2026-90561"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/strapi/strapi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b181702f0202b2c6d645d42b195a831f25cd0b03"
                },
                {
                  "last_affected": "7ad165f89d1ccae3c524439a36fc619ecf6b23f9"
                },
                {
                  "introduced": "ce84fada19d58a7dfbdd553035e6558f8befcba4"
                },
                {
                  "fixed": "b1e707d60def66aa840ad29db1a15f2ca574c154"
                },
                {
                  "fixed": "875752612c30f951546904a29469e51e17e0ac37"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "last_affected": "4.26.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "5.0.0"
                      },
                      {
                        "fixed": "5.48.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "875752612c30f951546904a29469e51e17e0ac37"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v5.31.0",
            "v5.24.1",
            "v5.14.0",
            "v4.25.22",
            "v4.25.16",
            "v5.0.4",
            "v5.0.2-beta.0",
            "v5.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90561.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.314853876Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90561.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90561",
        "https://www.vulncheck.com/advisories/strapi-4-x-through-4.26.2-and-5-x-before-5.48.1-stored-xss-via-wysiwyg",
        "https://github.com/strapi/strapi/issues/26857",
        "https://github.com/strapi/strapi/commit/875752612c30f951546904a29469e51e17e0ac37",
        "https://github.com/strapi/strapi",
        "https://github.com/strapi/strapi/blob/v5.46.0/packages/core/content-manager/admin/src/pages/EditView/components/FormInputs/Wysiwyg/PreviewWysiwyg.tsx"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90561.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90561",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517518,
  "published_at": "2026-09-13T10:45:35.988+00:00"
}