Gravity Forms <= 2.9.30 — Unauthenticated Stored Cross-Site Scripting via Consent Field Hidden Input

Overview

Advisory ID

CVE-2026-5113

Product

Gravity Forms gravityforms

Affected

≤2.9.30

Fixed in

2.9.31

Weakness

CWE-79 Cross-Site Scripting

Required access

No account needed

Published

May 1, 2026 · updated Nov 13, 2026

Credit

Huynh Pham Thanh Luc

Source

Wordfence Intelligence

The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Consent field hidden inputs in versions up to and including 2.9.30. This is due to a flawed state validation mechanism that fails open when input is sanitized by wp_kses(), combined with insufficient output escaping. The state validation logic creates two hashes (raw input and wp_kses-sanitized input) and only fails validation if BOTH hashes don't match the original state. When an attacker injects XSS payloads using tags stripped by wp_kses() (like <svg>), the sanitized hash matches while the malicious raw value is preserved and saved to the database. When administrators view the Entries List page, the stored malicious consent label is retrieved and output without escaping, causing the XSS payload to execute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in entries that will execute whenever an authenticated administrator accesses the entries list page.

Not sure which version you run? Run a passive check — it reads public files only.

Remediation & mitigations

1. Update to version 2.9.31, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.