This vulnerability (CVE-2026-57656) is an instance of CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as cross-site scripting (XSS), in the peregrinethemes Hester Core product. It affects versions up to and including 1.1.8. The flaw allows an author-level user to inject malicious scripts that could be executed in the context of other users, potentially leading to partial compromise of confidentiality, integrity, and availability. The CVSS vector indicates network attack vector, low attack complexity, required privileges at the author level, user interaction required, and scope change. No vendor advisory or patch information is currently available, and no known exploits have been reported.

Successful exploitation could allow an attacker with author-level privileges to execute arbitrary scripts in the context of other users, potentially leading to partial disclosure of information, modification of data, and disruption of service. The CVSS score of 5.9 reflects a medium severity impact on confidentiality, integrity, and availability. However, exploitation requires author privileges and user interaction, which limits the attack surface.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, consider restricting author-level privileges and monitoring for suspicious activity related to script injection. Avoid granting unnecessary author permissions to untrusted users.