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

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.

Source published

29 Oct 2026 11:27:14 UTC

Source modified

29 Oct 2026 11:27:14 UTC

Observed here

29 Oct 2026 13:12:12 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 4.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N