CVE-2026-75091 is a stored cross-site scripting vulnerability in the mdmag Quill Forms | Conversational Multi Step Forms, Surveys & quizzes WordPress plugin. It affects all versions up to and including 5.7.1. The issue is due to improper neutralization of input during web page generation (CWE-79), specifically insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject malicious scripts that execute in the context of users visiting the compromised 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 or user interaction required, and impacts confidentiality and integrity with no availability impact. There is no vendor advisory or patch information available at this time.

An unauthenticated attacker can exploit this vulnerability to inject and execute arbitrary JavaScript in the context of users visiting affected pages, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality and integrity. There is no impact on availability. The vulnerability affects all users of the plugin on vulnerable versions.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling or removing the vulnerable plugin to prevent exploitation. Monitor official vendor channels for updates or patches addressing this vulnerability.