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CVE-2026-93766
Happyforms Pro <= 1.38.9 - Unauthenticated Stored Cross-Site Scripting via 'happyforms_client_referer' Parameter
Published 7 Nov 2026 • Updated 7 Nov 2026
Severity: HIGH
7.2
CVSS Base Score
Description
The Happyforms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'happyforms_client_referer' parameter in all versions up to, and including, 1.38.9 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.
Affected products (1)
- Happyforms Happyforms Pro
Problem types
- CWE-79 Improper Neutralization of Input During Web Page Generation
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