picocms Pico - Host Header Injection Enables Script Source Hijacking

{
  "id": "fde80bf618cee3b9e2d6088f9511a2f2807214fca14ca3d3be589a169614e208",
  "url": "https://osv.dev/vulnerability/CVE-2026-72574",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "picocms Pico - Host Header Injection Enables Script Source Hijacking",
    "summary": "A host header injection vulnerability in picocms/Pico through 2.1.4 allows an unauthenticated remote attacker to control the origin of JavaScript and CSS assets loaded by the default theme. When base_url is unset (the default), Pico::getBaseUrl in lib/Pico.php builds the base URL from unvalidated Host, X-Forwarded-Host, X-Forwarded-Proto, and X-Forwarded-Port request headers.",
    "evidence": "osv:CVE-2026-72574",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-72574",
      "aliases": [
        "CVE-2026-72574"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/picocms/pico",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "7228129cade3f812f22904b503c939b04a75c9dd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.4"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.4",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.0.5-beta.1",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v1.0.0-beta.2",
            "v1.0.0-beta.1",
            "v0.9",
            "0.8",
            "0.7",
            "v0.6.2",
            "v0.6.1",
            "v0.6",
            "v0.5",
            "v0.4.1",
            "v0.4",
            "v0.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72574.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.223421987Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72574.json",
        "https://github.com/picocms/Pico",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72574",
        "https://picocms.org",
        "https://github.com/picocms/Pico/blob/master/lib/Pico.php"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-644"
        ],
        "cna_assigner": "TuranSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72574.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72574",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509123,
  "published_at": "2026-08-10T10:40:57.868+00:00"
}