{"id":"CVE-2026-6378","summary":"Maxi Blocks \u003c= 2.1.9 - Authenticated (Author+) Stored Cross-Site Scripting via Style Card REST API","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.","modified":"2026-07-08T08:13:48.698705452Z","published":"2026-05-02T03:36:42.285Z","database_specific":{"cna_assigner":"Wordfence","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6378.json","cwe_ids":["CWE-79"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/maxi-blocks/maxi-blocks","events":[{"introduced":"0"},{"last_affected":"c95407298f09c94a85bada86127db5ab0a30d26f"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"2.1.9"}]}}],"versions":["v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.4","v2.1.2","v2.0.9","v2.1.0","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.1","v2.0.0","v1.9.9","v1.9.8","v1.9.7","v1.9.2","v1.9.1","v1.9.0","v1.8.9","v1.8.8","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","1.8.0","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v.1.6.1","v1.6.0","v1.5.8","v1.5.7","v1.5.6","v1.5.5","v1.5.3","v1.5.2","v1.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6378.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"}]}