by All
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.
CVSS Score
7.2
HIGH
Published
16 Jul 2026 05:16
Modified
18 Jul 2026 03:16
Vendor
All
Source
CIRCL
CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Network
Complexity
Low
Privileges
None
Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Weaknesses (CWE)
CWE-79
References
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php
plugins.trac.wordpress.org
/browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php
plugins.trac.wordpress.org
/changeset
www.wordfence.com
/threat-intel/vulnerabilities/id/848b9c6d-e0db-43ad-ac6d-3674435339dd