CVE-2026-66663 is an unauthenticated Cross-Site Scripting (XSS) vulnerability in the WP Data Access plugin developed by Passionate Programmer Peter. It affects all versions up to and including 5.5.79. The vulnerability arises from improper neutralization of input during web page generation, classified under CWE-79. The CVSS 3.1 base score is 7.1, indicating high severity, with network attack vector, low attack complexity, no privileges required, user interaction required, and scope changed. The impact includes low confidentiality, integrity, and availability impacts. No vendor advisory or patch is currently available, and no known exploits are reported in the wild.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected application without authentication. This may lead to partial disclosure of sensitive information, modification of data, or disruption of service. The CVSS vector indicates a low complexity attack that requires user interaction but no privileges, with a scope change and low impact on confidentiality, integrity, and availability.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or remediation level is provided, users should monitor the vendor's communications for updates. Until a fix is available, consider applying temporary mitigations such as input validation or disabling vulnerable features if feasible.