CVE-2026-107743

Mapster WP Maps <= 2.0.5 - Unauthenticated Stored Cross-Site Scripting via 'config.loading.background' Parameter

2026-10-28 21:16
whatm

Strategic Overview

Status
Patched in 2.0.6
Affected Plugin
Mapster WP Maps
Affected Version
<= 2.0.5
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation
CVE
CVE-2026-107743
View all Mapster WP Maps vulnerabilities

At a glance

CVE-2026-107743 is a high-severity Improper Neutralization of Input During Web Page Generation vulnerability in the Mapster WP Maps WordPress plugin, affecting versions <= 2.0.5. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.0.6; sites on affected versions should update now. Disclosed October 2026, reported by whatm.

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation

Mapster WP Maps <= 2.0.5 carries this weakness at mapster_write_config_to_acf(), and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Mapster WP Maps the fix is 2.0.6: builds <= 2.0.5 are affected, anything from 2.0.6 onward is not.

Remediation

Update to version 2.0.6, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Mapster WP Maps 2.0.6 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-107743https://www.wordfence.com/threat-intel/vulnerabilities/id/de1c951f-8b01-44cf-b192-412de9fae4fahttps://nvd.nist.gov/vuln/detail/CVE-2026-107743

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C