Stored Cross-Site Scripting Vulnerability in Quill Forms Plugin for WordPress
CVE-2026-15664

7.2HIGH

Key Information:

Vendor

WordPress
Status
Quill Forms | Conversational Multi Step Forms, Surveys & Quizzes
Vendor
CVE Published:
19 September 2026

What is CVE-2026-15664?

The Quill Forms plugin for WordPress is susceptible to Stored Cross-Site Scripting due to inadequate input validation and output filtering for the 'Other' option in multiple-choice questions. Attackers can exploit this vulnerability to inject malicious scripts, which execute in the context of the WordPress admin panel when an administrator views submitted form entries. This poses significant risks as it allows unauthorized users to potentially compromise the site's integrity and manageability.

Affected Version(s)

Quill Forms | Conversational Multi Step Forms, Surveys & quizzes 0 <= 5.7.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/quillforms/tag...
https://plugins.trac.wordpress.org/browser/quillforms/tag...

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

zickzick2
.