What is CVE-2026-13042?

CVE-2026-13042 is a high-severity vulnerability in Yo35 Rpb Chessboard, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-07-16.

How severe is CVE-2026-13042?

High severity. CVSS v3 base score is 7.2 out of 10.

XSS in Yo35 Rpb Chessboard

CVE-2026-13042

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.004 (35.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Yo35 Rpb Chessboard — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-13042?: CVE-2026-13042 is a high-severity vulnerability in Yo35 Rpb Chessboard, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-07-16.
How severe is CVE-2026-13042?: High severity. CVSS v3 base score is 7.2 out of 10.