CVE-2026-109216

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CVE-2026-109216

Summary: Meta Box <= 5.15.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Background Field Array Keys

Details: The Meta Box – A Framework for Dynamic Websites plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'profile_background[<attacker-chosen key>]' parameter in all versions up to, and including, 5.15.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitability depends on a consuming plugin or theme built on Meta Box that exposes the background field to lower-privileged users and renders stored values via the rwmb_the_value()/format_single_value() pattern; the effective minimum privilege is whatever role that consumer permits, demonstrated at Subscriber level.

References: https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/fields/background.php#L154, https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.2/inc/sanitizer.php#L170, https://plugins.trac.wordpress.org/browser/meta-box/tags/5.15.3/inc/fields/background.php, https://www.wordfence.com/threat-intel/vulnerabilities/id/7a8948f5-8bcf-48f2-b3a6-bfa24ba9bef0?source=cve, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109216.json, https://nvd.nist.gov/vuln/detail/CVE-2026-109216, https://github.com/wpmetabox/meta-box/pull/1709