CVE-2026-14556

Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms < 1.26.15 - Unauthenticated HTML Injection

2026-10-19 00:00

Strategic Overview

Status: Patched in 1.26.15
Affected Plugin: Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms
Affected Version: < 1.26.15
CVSS: 5.8Medium
Weakness type: CWE-20 · Improper Input Validation
CVE: CVE-2026-14556

View all Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms vulnerabilities

At a glance

CVE-2026-14556 is a medium-severity Improper Input Validation vulnerability in the Happyforms WordPress plugin, affecting versions < 1.26.15. It carries a CVSS score of 5.8 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.26.15; sites on affected versions should update now. Disclosed October 2026, reported by minaruzzaman shovon.

Vulnerability Overview

The Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms plugin for WordPress is vulnerable to HTML Injection in all versions up to 1.26.15. This is due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary HTML in pages that will render whenever a user accesses an injected page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-20: Improper Input Validation

Reaching this weakness in Happyforms < 1.26.15 takes no account at all. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.

The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Happyforms the fix is 1.26.15: builds < 1.26.15 are affected, anything from 1.26.15 onward is not.

Remediation

Update to version 1.26.15, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Happyforms 1.26.15 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-14556 https://www.wordfence.com/threat-intel/vulnerabilities/id/ad7c56bf-44e5-4eaf-8342-10e66ee49092 https://nvd.nist.gov/vuln/detail/CVE-2026-14556

Related records

Other vulnerabilities in Happyforms – Form Builder for WordPress: Drag & Drop Contact Forms, Surveys, Payments & Multipurpose Forms

CVSS Vector

5.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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