CVE-2026-13042 json
RPB Chessboard <= 8.1.2 - Unauthenticated Stored Cross-Site Scripting via Comment Content
published 2026-07-16 3 mo ago modified 2026-07-18 3 mo ago also EUVD-2026-44865
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- yo35 RPB Chessboard
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/848b9c6d-e0db-43ad-ac6d-3674435339dd?source=cve
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L220
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L171
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.2/php/abstractcontroller.php#L190
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L220
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L171
- plugins.trac.wordpress.org /browser/rpb-chessboard/tags/8.1.0/php/abstractcontroller.php#L190
- plugins.trac.wordpress.org /changeset?reponame=&old=3604068%40rpb-chessboard&new=3604068%40rpb-chessboard
Sources
- CVE List CVE-2026-13042
- NVD CVE-2026-13042
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.