CMB2 <= 2.13.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Field Display Values

ID

WPSEC-2026-0117

Plugin

CMB2 (cmb2)

Affected

from 2.2.2 before 2.13.2

Remediation

Update to 2.13.2 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 None seen among sites WPSec scans, 2026-10-22

Attack surface

CMB2 on WPSec AttackSurface

Fix released

2026-09-30

Published

2026-10-01

Description

The CMB2 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via stored field values rendered by its default field display output (admin list-table columns enabled with the 'column' field parameter, and display_cb output) in versions 2.2.2 up to, and including, 2.13.1 due to insufficient output escaping. The textarea_code display wrapped the raw stored value in an <xmp> element, and textarea_code values are saved without tag stripping, so a value containing '</xmp>' broke out of the wrapper; the default text and text_money displays also echoed values unescaped. This makes it possible for authenticated attackers with contributor-level access and above, who can save fields in a CMB2 metabox registered by a theme or plugin, to inject arbitrary web scripts that execute whenever a user, such as an administrator viewing the post list, views the displayed field value. CMB2 registers no fields itself, so exploitation depends on the site's integration.

References

• https://wpsec.com/vuln/WPSEC-2026-0117/
• https://plugins.svn.wordpress.org/cmb2/tags/2.13.2/
• https://wordpress.org/plugins/cmb2/

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