Vulnerability · Published Oct 28, 2026 · Assigned by Wordfence
CVE-2026-116761CMB2 <= 2.13.4 - Unauthenticated Stored Cross-Site Scripting via Grouped WYSIWYG Field via Front-End Form
Medium 5.4
In plain English
A medium-severity cross-site scripting in CMB2 from jtsternberg. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official description
The CMB2 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'cmb43ex1_grp[0][txt] (wysiwyg field inside group — field id controlled by integrator config)' parameter in all versions up to, and including, 2.13.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when a site integrator renders the plugin's documented front-end form helper with a wysiwyg field inside a repeatable group on a publicly accessible page.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jtsternberg | CMB2 | 0 – through 2.13.4 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/97215367-08c0-46cc-a595-4475274a5a1c?source=cve
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.4/includes/CMB2_Field.php#L715
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.4/includes/types/CMB2_Type_Wysiwyg.php#L93
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.4/includes/helper-functions.php#L320
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.4/includes/CMB2_Sanitize.php#L447
- https://github.com/CMB2/CMB2/commit/fbeb7c4688dc5b8635a34978d837f1d458dcac44
- https://plugins.trac.wordpress.org/changeset/3767609/cmb2/trunk/includes/CMB2_Field.php