Unvalidated Input Vulnerability in HappyForms WordPress Plugin
CVE-2026-14556

5.4MEDIUM

Key Information:

Vendor

WordPress
Status
Happyforms
Vendor
CVE Published:
21 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-14556?

The HappyForms WordPress plugin version earlier than 1.26.15 has a security flaw where it fails to properly sanitize or escape user-controlled referral values. This oversight allows unauthenticated attackers to inject arbitrary HTML code into the form notification emails sent to site administrators. If exploited, this vulnerability could lead to malicious manipulation of emails, which can potentially harm the integrity of the website and deceive the administrators.

Affected Version(s)

HappyForms 0 < 1.26.15

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-14556 - Proof of Concept

References

https://wpscan.com/vulnerability/7673862c-b37c-4c7e-af3f-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

minaruzzaman shovon
WPScan
.