CVE-2026-15664: Quill Forms | Conversational Multi Step Forms, Surveys & quizzes <= 5.7.1 - Unauthenticated Stored Cross-Site Scripting via Multiple Choice 'Other' Value
The Quill Forms | Conversational Multi Step Forms, Surveys & quizzes plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Multiple Choice 'Other' Value in all versions up to, and including, 5.7.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected script executes in the context of the WordPress admin results view, making administrators the primary target when reviewing submitted form entries.
Affected Software
Event History
Frequently Asked Questions
Who is most exposed to this issue?
WordPress sites using Quill Forms versions through 5.7.1 are exposed. Administrators are the primary target because the injected script runs when they review submitted form entries in the admin results view.
Does an attacker need an account or user interaction to exploit it?
No account or authentication is required, and the attack has low complexity. An attacker can submit a malicious value through a Multiple Choice "Other" field; exploitation occurs when an administrator accesses the affected submission in the results view.
What data or actions could be affected if exploitation succeeds?
The script executes in the WordPress administrator's browser context. The reported impact includes low confidentiality and integrity impact, while no availability impact is indicated.