# Bold Page Builder <= 5.9.11 - Authenticated (Contributor+) Stored Cross-Site Scripting via Leaflet Map 'Additional map layers' Field

- **ID:** WPSEC-2026-2879
- **Plugin:** Bold Page Builder (`bold-page-builder`), https://wordpress.org/plugins/bold-page-builder/
- **Affected versions:** all versions before 5.9.12
- **Fixed in:** 5.9.12 (Update to 5.9.12 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-11-12)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/bold-page-builder
- **Fix released:** 2026-11-10
- **Published:** 2026-11-12
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2879/

## Description

The Bold Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Leaflet (OpenStreetMap) map element's custom style ('Additional map layers') field in all versions up to, and including, 5.9.11. This is due to the base64-encoded layer definitions bypassing WordPress's HTML filtering, with layer attribution text written into the page via innerHTML and tile URLs left unvalidated. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts in pages that execute whenever a user accesses an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-2879/
- https://plugins.svn.wordpress.org/bold-page-builder/tags/5.9.12/
- https://wordpress.org/plugins/bold-page-builder/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2879/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.