CVE-2026-13042High· 7.2▾ Twilight

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

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score40/ 100 · Moderate

impact 39.6 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Jul 16, 2026

Updated

Jul 18, 2026

CVSS

7.2

Vendor

—

Product

—

CWE

CWE-79

Depth score

40 · Moderate

EPSS

0.43% · p37

Platforms

—

Source

NVD

Vector

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

EPSS history

Exploit-prediction probability, daily snapshots since Jul 18.

0.2% → 0.4%▲ 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 39 days

Jul 16, 2026Published
Disclosed via NVD
Jul 18, 2026Record revised
Last analysed / modified upstream
Jul 18, 2026EPSS first tracked
0.2%
Aug 24, 2026EPSS peak
0.2% → 0.4%

CWE-79 #nvd

Full technical detail▾

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.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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