---
id: CVE-2026-13042
title: >-
  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
summary: >-
  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 u…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-07-16'
updated: '2026-07-18'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13042'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L171
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L190
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L220
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L171
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L190
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L220
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3604068%40rpb-chessboard&new=3604068%40rpb-chessboard
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/848b9c6d-e0db-43ad-ac6d-3674435339dd?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00428
epssPercentile: 0.34462
ingestedAt: '2026-07-18T18:24:14.458Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.