The Breeze Display plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) via the 'cal_size' parameter in versions up to 1.2.3. Authenticated attackers with Contributor or higher privileges can inject arbitrary web scripts due to insufficient input sanitization and output escaping. This vulnerability allows script execution in the context of users viewing the injected pages, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, privileges required, no user interaction, and partial impact on confidentiality and integrity.

An attacker with Contributor-level or higher access can inject persistent malicious scripts into pages via the 'cal_size' parameter. These scripts execute in the browsers of users who access the compromised pages, potentially leading to information disclosure or manipulation of page content. The vulnerability does not affect availability. No known exploits have been reported in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the Breeze Display plugin if possible. Monitor for updates from the vendor regarding patches or official mitigations.