This vulnerability (CVE-2026-57755) is classified as CWE-79, indicating improper neutralization of input leading to Cross-Site Scripting (XSS) in the Misbah WP Mosaic Gallery – Advanced Gallery plugin. It affects versions up to and including 1.2.0. The issue allows contributors with limited privileges to inject malicious scripts during web page generation, potentially impacting confidentiality, integrity, and availability. The CVSS 3.1 base score is 6.5, reflecting a medium severity with network attack vector, low attack complexity, required privileges of low, user interaction required, and scope changed. No vendor advisory or patch information is currently available, and no known exploits are reported in the wild.

Successful exploitation of this vulnerability could allow an attacker with contributor-level access to execute arbitrary scripts in the context of the affected web application. This may lead to partial compromise of confidentiality, integrity, and availability of the application or user data. The attack requires user interaction and low privileges but can be performed remotely over the network.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor privileges where possible and monitor for suspicious activity related to the Mosaic Gallery plugin. Avoid granting unnecessary contributor access to untrusted users.