CVE-2025-5286: Bold Builder <= 5.3.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via additional_settings Parameter

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-29 · updated 2026-06-17
Weakness: CWE-79

Description

The Bold Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘additional_settings’ parameter in all versions up to, and including, 5.3.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

boldthemes Bold Page Builder: through 5.3.6

References

https://plugins.trac.wordpress.org/browser/bold-page-builder/tags/5.3.6/content_elements/bt_bb_content_slider/bt_bb_content_slider.php#L156
https://plugins.trac.wordpress.org/browser/bold-page-builder/tags/5.3.6/content_elements/bt_bb_content_slider/bt_bb_content_slider.php#L176
https://plugins.trac.wordpress.org/browser/bold-page-builder/tags/5.3.6/content_elements/bt_bb_content_slider/bt_bb_content_slider.php#L7
https://plugins.trac.wordpress.org/browser/bold-page-builder/tags/5.3.7/content_elements/bt_bb_content_slider/bt_bb_content_slider.php#L156
https://plugins.trac.wordpress.org/changeset/3302452
https://wordpress.org/plugins/bold-page-builder/#developers
https://www.wordfence.com/threat-intel/vulnerabilities/id/9ae076e4-ad15-4069-be10-f0f4aced4132?source=cve

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