ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-4406

The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the parameter in the AJAX action in all versions up to, and including, 2.9.30.

Published Apr 8, 2026 · catalog updated Jul 24, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-4406. EPSS is 0.39%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
stated named in the record

The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the parameter in the AJAX action in all versions up to, and including, 2.9.30. This is due to the method outputting JSON-encoded data wrapped in HTML comment delimiters using and , which serves the response with a header instead of . The function does not HTML-encode angle brackets within JSON string values, allowing injected HTML/script tags in array values to be parsed and executed by the browser. The required is generated with and is publicly embedded on every page that renders a Gravity Forms form, making it identical for all unauthenticated visitors within the same 12-hour nonce tick. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This vulnerability cannot be exploited against users who are authenticated on the target system, but could be used to alter the target page.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated named in the record<= 2.9.30

How to fix CVE-2026-4406

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-4406. EPSS is 0.39%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with named in the record <= 2.9.30. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 8, 2026 · NIST NVD

    Detected

    The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the parameter in the AJAX action in all versions up to, and including, 2.9.30. This is due to the method outputting JSON-encoded data wrapped in HTML comment delimiters using and , which serves the response with a header instead of . The function does not HTML-encode angle brackets within JSON string values,

  2. Jul 24, 2026 · NIST NVD

    Updated

    The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the parameter in the AJAX action in all versions up to, and including, 2.9.30. This is due to the method outputting JSON-encoded data wrapped in HTML comment delimiters using and , which serves the response with a header instead of . The function does not HTML-encode angle brackets within JSON string values,

Sources

  • CVE.orgVulnerability recordCVE-2026-4406

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4406

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4406

    The Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the parameter in the AJAX action in all versions up to, and including, 2.9.30. This is due to the method outputting JSON-encoded data w

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.