CVE-2026-15664 Cross-site scripting in Quill Forms | Conversational Multi Step Forms, Surveys & quizzes
Unauthenticated attackers can inject scripts via form fields that execute in the admin view, potentially compromising administrator accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15664?
CVE-2026-15664 is a high-severity cross-site scripting vulnerability in mdmag Quill Forms | Conversational Multi Step Forms, Surveys & quizzes, published on 19 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-15664?
How do I fix CVE-2026-15664?
No fix has been published for CVE-2026-15664 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-15664 being exploited?
There is no known exploitation of CVE-2026-15664 in the wild and no public exploit code.
Sources
Also known as GHSA-6hvq-jpx9-cm24.