CVE-2026-5109

Gravity Forms <= 2.10.0 - Unauthenticated Stored Cross-Site Scripting via Product Option

2026-05-01 00:00
Luc Huynh from Noventiq RedTeam

Strategic Overview

Status
Patched in 2.10.1
Affected Plugin
Gravity Forms
Affected Version
<= 2.10.0
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-5109
View all Gravity Forms vulnerabilities

At a glance

CVE-2026-5109 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Gravity Forms WordPress plugin, affecting versions <= 2.10.0. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.10.1; sites on affected versions should update now. Disclosed May 2026, reported by Luc Huynh from Noventiq RedTeam.

Vulnerability Overview

The Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 2.10.0. This is due to insufficient validation and output escaping of Product Option field values. The vulnerability exists because the state validation function accepts submitted values where the wp_kses()-sanitized version matches a legitimate option value, but then stores the raw unsanitized value in the database. When administrators view entry details via the Order Summary section, the option_label is output directly without escaping (view-order-summary.php line 32), executing the injected JavaScript. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in entry data that will execute whenever an administrator accesses the entry details 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Gravity Forms <= 2.10.0 carries this weakness at wp_kses(), and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Gravity Forms the fix is 2.10.1: builds <= 2.10.0 are affected, anything from 2.10.1 onward is not.

Remediation

Update to version 2.10.1, 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: Gravity Forms 2.10.1 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-2026-5109https://www.wordfence.com/threat-intel/vulnerabilities/id/651fa700-2462-4c9c-bd13-85f3a53a64dfhttps://nvd.nist.gov/vuln/detail/CVE-2026-5109

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C