Gravity Forms <= 2.9.30 - Reflected Cross-Site Scripting via 'form_ids' Parameter

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Summary

CVECVE-2026-4406
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 00:16:05 UTC
Updated2026-04-08 21:26:35 UTC
DescriptionThe Gravity Forms plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the `form_ids` parameter in the `gform_get_config` AJAX action in all versions up to, and including, 2.9.30. This is due to the `GFCommon::send_json()` method outputting JSON-encoded data wrapped in HTML comment delimiters using `echo` and `wp_die()`, which serves the response with a `Content-Type: text/html` header instead of `application/json`. The `wp_json_encode()` function does not HTML-encode angle brackets within JSON string values, allowing injected HTML/script tags in `form_ids` array values to be parsed and executed by the browser. The required `config_nonce` is generated with `wp_create_nonce('gform_config_ajax')` 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

EPSS: 0.000630000 probability, percentile 0.193760000 (date 2026-04-14)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gravity Forms Gravity Forms affected 2.9.30 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-co... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gravityforms/trunk/common.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/4126d452-65a9-48f5-a3f5-5be1b... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-se... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/items/class-gf-con... [email protected] plugins.trac.wordpress.org
docs.gravityforms.com/gravityforms-change-log [email protected] docs.gravityforms.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Anthony Cihan (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-18T21:05:25.000ZVendor Notified
CNA2026-04-07T10:36:04.000ZDisclosed
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