The SMTP for Amazon SES – YaySMTP WordPress plugin versions up to 1.7.1 suffer from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. This allows unauthenticated attackers to inject arbitrary web scripts that execute in the context of users visiting the injected pages. The vulnerability has a CVSS 3.1 base score of 7.2, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts confidentiality and integrity with scope change.

Successful exploitation of this vulnerability could allow attackers to execute arbitrary scripts in the browsers of users who visit the affected pages, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality and integrity. There is no indication of availability impact. No known exploits in the wild have been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should consider disabling or removing the affected plugin version or applying manual input sanitization and output escaping if feasible. Monitor official yaycommerce communications for updates on patches or mitigations.