CVE-2026-102772
Received Received - Intake

Stored XSS in CMB2 WordPress Plugin

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: Wordfence

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.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-102772
EUVD
EUVD-2026-91243

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
webdevstudios cmb2 to 2.13.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

The CMB2 plugin for WordPress has a stored cross-site scripting (XSS) vulnerability due to insufficient input sanitization and output escaping in the textarea_code field parameter. This allows unauthenticated attackers to inject malicious scripts into pages. The attack is possible because the front-end save path only requires a CMB2 box nonce, which is accessible via a simple GET request even to unauthenticated users.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the CMB2 plugin up to version 2.13.1. Check for unauthorized script injections in textarea_code fields via browser developer tools or server logs. No specific commands are provided in the context.

Impact Analysis

This vulnerability allows attackers to inject arbitrary web scripts into pages. When users access an infected page, the injected scripts execute, potentially stealing user data, session cookies, or performing actions on behalf of the user. It can also lead to defacement of websites or spreading malware.

Compliance Impact

This vulnerability could lead to data breaches, compromising personal or sensitive data. For GDPR, it may result in unauthorized access to personal data, triggering reporting obligations and potential fines. For HIPAA, it could expose protected health information, violating compliance requirements and leading to penalties.

Mitigation Strategies

Immediately update the CMB2 plugin to the latest version beyond 2.13.1. Disable or restrict access to CMB2 forms if possible. Review server logs for signs of exploitation and remove any injected scripts.

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