FlatPress - Stored Cross-Site Scripting via Unescaped Comment and Contact Form Fields

{
  "id": "78ccfcba8aecd36484b3ba7e91dcf33df68284a38cc491df4982efc845f3d376",
  "url": "https://osv.dev/vulnerability/CVE-2026-56785",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FlatPress - Stored Cross-Site Scripting via Unescaped Comment and Contact Form Fields",
    "summary": "FlatPress contains a stored cross-site scripting vulnerability in comment and contact forms where name, URL, and email fields are rendered without proper output encoding in Smarty templates. Attackers can inject arbitrary HTML and JavaScript through these fields to execute malicious scripts in browsers of viewers including administrators, or bypass URL scheme validation to inject javascript: or data: URIs.",
    "evidence": "osv:CVE-2026-56785",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-56785",
      "aliases": [
        "CVE-2026-56785"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flatpressblog/flatpress",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "10be83cbaac5ce0e51250b9d57de7f257b8f34f8"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "10be83cbaac5ce0e51250b9d57de7f257b8f34f8"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.5.1",
            "1.5",
            "1.5.rc2",
            "1.5.rc1",
            "1.4.1",
            "1.4",
            "1.4.rc2",
            "1.4.rc1",
            "1.3",
            "1.3.rc1",
            "1.3.beta1",
            "1.2.1",
            "1.2",
            "1.2.beta2",
            "1.2.beta1",
            "1.1",
            "v1.0.3.php7",
            "v1.0.3",
            "v1.0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56785.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.926231521Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56785.json",
        "https://github.com/dilipk5/flatpressd-cms-sxss",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56785",
        "https://www.vulncheck.com/advisories/flatpress-stored-cross-site-scripting-via-unescaped-comment-and-contact-form-fields",
        "https://github.com/flatpressblog/flatpress/commit/10be83cbaac5ce0e51250b9d57de7f257b8f34f8"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-79"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "10be83c"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "*"
                  }
                ],
                "source": "CPE_FIELD",
                "strategy": "CPEApplicability"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56785.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-56785",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503381,
  "published_at": "2026-06-23T22:09:35.831+00:00"
}