Vulnerability-Lookup

GHSA-M698-RPJV-64J7

Vulnerability from github – Published: 2026-04-08 00:30 – Updated: 2026-04-08 00:30

Details

The 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.

Severity ?

4.7 (Medium)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-4406"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-08T00:16:05Z",
    "severity": "MODERATE"
  },
  "details": "The 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(\u0027gform_config_ajax\u0027)` 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.",
  "id": "GHSA-m698-rpjv-64j7",
  "modified": "2026-04-08T00:30:27Z",
  "published": "2026-04-08T00:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4406"
    },
    {
      "type": "WEB",
      "url": "https://docs.gravityforms.com/gravityforms-change-log"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/common.php#L8267"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-collection.php#L56"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-service-provider.php#L144"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/items/class-gf-config-global.php#L22"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4126d452-65a9-48f5-a3f5-5be1b8fff80c?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-4406 (GCVE-0-2026-4406)

Vulnerability from cvelistv5 – Published: 2026-04-07 23:25 – Updated: 2026-04-08 16:48

Title

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

Summary

The 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.

Severity ?

4.7 (Medium)


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

CWE

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

Assigner

Wordfence

References

URL

Tags

	https://www.wordfence.com/threat-intel/vulnerabil…
	https://plugins.trac.wordpress.org/browser/gravit…
	https://plugins.trac.wordpress.org/browser/gravit…
	https://plugins.trac.wordpress.org/browser/gravit…
	https://plugins.trac.wordpress.org/browser/gravit…
	https://docs.gravityforms.com/gravityforms-change-log/

Impacted products

	Vendor	Product	Version
	Gravity Forms	Gravity Forms	Affected: 0 , ≤ 2.9.30 (semver)

Credits

Anthony Cihan

Show details on NVD website

JSON

To clipboard

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    "adp": [
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        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-4406",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-08T15:15:11.294642Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gravity Forms",
          "vendor": "Gravity Forms",
          "versions": [
            {
              "lessThanOrEqual": "2.9.30",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      "credits": [
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          "type": "finder",
          "value": "Anthony Cihan"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The 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(\u0027gform_config_ajax\u0027)` 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."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
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              "type": "CWE"
            }
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        "dateUpdated": "2026-04-08T16:48:35.829Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/4126d452-65a9-48f5-a3f5-5be1b8fff80c?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/common.php#L8267"
        },
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        },
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          "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/class-gf-config-service-provider.php#L144"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gravityforms/trunk/includes/config/items/class-gf-config-global.php#L22"
        },
        {
          "url": "https://docs.gravityforms.com/gravityforms-change-log/"
        }
      ],
      "timeline": [
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          "lang": "en",
          "time": "2026-03-18T21:05:25.000Z",
          "value": "Vendor Notified"
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          "lang": "en",
          "time": "2026-04-07T10:36:04.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Gravity Forms \u003c= 2.9.30 - Reflected Cross-Site Scripting via \u0027form_ids\u0027 Parameter"
    }
  },
  "cveMetadata": {
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    "datePublished": "2026-04-07T23:25:27.669Z",
    "dateReserved": "2026-03-18T20:50:03.678Z",
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  },
  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-M698-RPJV-64J7

CVE-2026-4406 (GCVE-0-2026-4406)

Tags

Sightings

Nomenclature