{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.1.9"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "c95407298f09c94a85bada86127db5ab0a30d26f"
            }
          ],
          "repo": "https://github.com/maxi-blocks/maxi-blocks",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Wordfence",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6378.json"
  },
  "details": "The Maxi Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `/wp-json/maxi-blocks/v1.0/style-card` REST API endpoint in all versions up to, and including, 2.1.9 due to insufficient input sanitization and output escaping of the `sc_styles` parameter. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts that execute on every page where the plugin's style card styles are loaded, including across the entire WordPress admin panel.",
  "id": "CVE-2026-6378",
  "modified": "2026-07-08T05:36:00.658796950Z",
  "published": "2026-05-02T03:36:42.285Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/maxi-blocks/maxi-blocks/pull/6250/changes/8db3267df9858f684e420566227ed2ea7954d9a9"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L1010"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L1021"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L979"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L981"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.10/core/class-maxi-api.php#L987"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-api.php#L221"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-api.php#L979"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/maxi-blocks/tags/2.1.9/core/class-maxi-style-cards.php#L197"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/22f05048-df38-4f26-82a3-53caac995283?source=cve"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6378.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6378"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Maxi Blocks \u003c= 2.1.9 - Authenticated (Author+) Stored Cross-Site Scripting via Style Card REST API"
}