CVE-2026-13042

HIGH 7.2

RPB Chessboard <= 8.1.2 - Unauthenticated Stored Cross-Site Scripting via Comment Content

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	yo35
Product	rpb chessboard
Published	Jul 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

yo35 / RPB Chessboard

0 ≤ 8.1.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

Credits

theviper17y