Description
The Mapster WP Maps plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.0.5. This is due to the /wp-json/mapster-wp-maps/save-mapmaker REST route being registered with a permission_callback that unconditionally returns true (no capability check, no nonce), together with the mapster_write_config_to_acf() helper only sanitizing string config values with sanitize_text_field() — which strips HTML tags but leaves quote characters intact — and the mapster_wp_map shortcode renderer in mapster_wordpress_maps_shortcode_display() concatenating the stored loading_background_color value into a single-quoted inline style attribute without esc_attr(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
References6
- plugins.trac.wordpress.org/browser/mapster-wp-maps/tags/2.0.5/a…
- plugins.trac.wordpress.org/browser/mapster-wp-maps/tags/2.0.5/a…
- plugins.trac.wordpress.org/browser/mapster-wp-maps/tags/2.0.5/a…
- plugins.trac.wordpress.org/browser/mapster-wp-maps/tags/2.0.5/p…
- plugins.trac.wordpress.org/browser/mapster-wp-maps/tags/2.0.6/p…
- www.wordfence.com/threat-intel/vulnerabilities/id/de1c951f-8b01…
Metrics
- CVSS 3.1
-
7.2
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 34 · as of 3 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.