CVE-2026-57366 is an unauthenticated cross-site scripting (XSS) vulnerability in WPAdverts versions up to 2.3.1. The issue arises from improper neutralization of input during web page generation, classified under CWE-79. The vulnerability allows remote attackers to inject malicious scripts without authentication, potentially affecting confidentiality, integrity, and availability of the affected web application. 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 with low impact on confidentiality, integrity, and availability. No patch or official remediation has been published as of the data provided.

Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary scripts in the context of the vulnerable WPAdverts plugin, potentially leading to partial compromise of confidentiality, integrity, and availability of the affected system. This may enable actions such as session hijacking, defacement, or other malicious activities that rely on script execution within the victim's browser.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider applying temporary mitigations such as input validation or output encoding if feasible. Monitor vendor channels for updates and apply patches promptly once available.