What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
RPB Chessboard versions 8.1.2 and earlier contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into the application. The vulnerability can be exploited over the network without authentication or user interaction. Affected sites may serve malicious content to visitors, potentially compromising user data or session security.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in visitors' browsers and affects other users or the site itself.
Potential impact on your site
04Site Impact
Visitors may be redirected, have sessions hijacked, or see malicious content injected into pages.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user action required.
Key dates
06Disclosure timeline
July 16, 2026
CVE published
July 18, 2026
Record updated
