CVE-2026-13042
Received Received - Intake

Stored XSS in RPB Chessboard WordPress Plugin

Publication date: 2026-07-16

Last updated on: 2026-07-16

Assigner: Wordfence

Description
The RPB Chessboard plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 8.1.2 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. WordPress's save-time kses sanitization does not mitigate this issue because the crafted payload uses only kses-allowed tags and attributes (such as an <a> element with title and href), and the dangerous attribute-breaking HTML is synthesized entirely at render time by the plugin's own comment_text filter.

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Meta Information

Published
2026-07-16
Last Modified
2026-07-16
Generated
2026-07-16
AI Q&A
2026-07-16
EPSS Evaluated
N/A
NVD
CVE-2026-13042
EUVD
EUVD-2026-44865

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpchessboard rpb_chessboard to 8.1.2 (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 RPB Chessboard plugin for WordPress has a stored cross-site scripting vulnerability due to insufficient input sanitization and output escaping in comment content. This allows unauthenticated attackers to inject malicious scripts into pages that execute when users view the affected pages. The plugin's own comment_text filter synthesizes dangerous HTML at render time, bypassing WordPress's built-in sanitization.

Impact Analysis

Attackers could steal user sessions, redirect visitors to malicious sites, or perform actions on behalf of users. This could lead to data theft, account compromise, or defacement of websites using the vulnerable plugin version.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles or HIPAA's security requirements. It may result in data breaches, triggering compliance violations and potential legal penalties.

Mitigation Strategies

Update the RPB Chessboard plugin to the latest version beyond 8.1.2 to ensure proper input sanitization and output escaping is applied.

Executive Summary

The RPB Chessboard plugin for WordPress has a stored cross-site scripting vulnerability due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject malicious scripts via comment content, which execute when users view the affected page. The plugin's own comment_text filter synthesizes dangerous HTML at render time, bypassing WordPress's built-in sanitization.

Impact Analysis

This vulnerability allows attackers to inject malicious scripts into WordPress pages. If exploited, it could lead to unauthorized actions on behalf of users, theft of sensitive data like cookies or session tokens, or defacement of the website. Users visiting the compromised page may have their browsers compromised.

Compliance Impact

This vulnerability could lead to data breaches, exposing user data and violating privacy regulations like GDPR or HIPAA. Non-compliance may result in legal penalties, fines, or reputational damage due to unauthorized access to sensitive information.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the RPB Chessboard plugin version 8.1.2 or earlier. Check for malicious scripts in comment content by reviewing database entries or rendered pages. No specific commands are provided in the context.

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