The 워드프레스 결제 심플페이 – 우커머스 결제 플러그인 plugin for WordPress suffers from a reflected cross-site scripting vulnerability due to the use of the add_query_arg() function without proper escaping of URL parameters. This allows unauthenticated attackers to inject malicious scripts into web pages, which execute when a victim clicks a specially crafted link. The vulnerability affects all versions up to and including 5.2.2. The CVSS 3.1 base score is 6.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity with no impact on availability.

Successful exploitation can lead to execution of arbitrary scripts in the context of the affected website, potentially allowing attackers to steal user session data or perform actions on behalf of the user. The impact is limited to confidentiality and integrity with no direct availability impact. The vulnerability requires user interaction (clicking a link) and does not require authentication.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when clicking links related to this plugin and consider disabling or removing the plugin if possible. Monitor official vendor channels for updates regarding patches or mitigations.