Vulnerabilities / Meta Box - WordPress Custom Fields Framework / WPSEC-2026-1301
Meta Box - WordPress Custom Fields Framework <= 5.15.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Editor Field
Medium 6.4
CWE-79Fixed in 5.15.3
- ID
- WPSEC-2026-1301
- Plugin
- Meta Box – A Framework for Dynamic Websites (meta-box)
- Affected
- from 5.11.0 before 5.15.3
- Remediation
- Update to 5.15.3 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-21
- Attack surface
- Meta Box - WordPress Custom Fields Framework on WPSec AttackSurface
- Fix released
- Published
Description
The Meta Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the block_editor field type in all versions up to, and including, 5.15.2 due to the field value being saved without any sanitization, even for users lacking the unfiltered_html capability. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts into a block_editor custom field that execute whenever a user accesses a page where the field is rendered. Exploitation requires a block_editor field to be registered on content the attacker can edit.
References
- https://wpsec.com/vuln/WPSEC-2026-1301/
- https://plugins.svn.wordpress.org/meta-box/tags/5.15.3/
- https://wordpress.org/plugins/meta-box/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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