Stored Cross-Site Scripting in Happyforms Pro Plugin for WordPress
CVE-2026-93766

7.2HIGH

Key Information:

Vendor

WordPress
Status
Happyforms Pro
Vendor
CVE Published:
7 November 2026

What is CVE-2026-93766?

The Happyforms Pro plugin for WordPress is susceptible to a Stored Cross-Site Scripting vulnerability due to inadequate input validation and output sanitization on the 'happyforms_client_referer' parameter. This flaw allows unauthenticated attackers to embed malicious web scripts into pages that execute whenever a user visits the compromised page, posing a significant risk to users and potentially leading to account hijacking and data theft.

Affected Version(s)

Happyforms Pro 0 <= 1.38.9

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://wordpress.org/plugins/happyforms-upgrade/#developers
https://happyforms.io/whats-new/

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

Bao Le
.