CVE-2026-39720: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in mapster Mapster WP Maps

CVE-2026-39720 is an improper neutralization of input during web page generation (CWE-79) vulnerability in Mapster WP Maps, affecting versions up to and including 2.0.4. It allows unauthenticated attackers to perform Cross-Site Scripting (XSS) attacks, which can lead to partial compromise of confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and scope change.

Successful exploitation can lead to execution of arbitrary scripts in the context of the victim's browser, potentially allowing theft of sensitive information, session hijacking, or other malicious actions affecting confidentiality, integrity, and availability. The vulnerability is exploitable without authentication but requires user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. In the absence of an official fix, consider applying web application firewall (WAF) rules to detect and block XSS payloads targeting Mapster WP Maps. Monitor vendor channels for updates and apply patches promptly once available.