Gravity Forms <= 2.9.30 - Reflected Cross-Site Scripting via 'form_ids' Parameter
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Gravity Forms | <= 2.9.30 | 2.9.31 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- WordPress
- Package
Gravity Forms- Disclosed
- 07.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 4126d452-65a9-48f5-a3f5-5be1b8fff80c - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Gravity Forms
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 26
- First → latest
- 02.2015 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 7
- High 11
- Medium 8
Disclosures per year
- 2017: 0
- 2018: 0
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 2
- 2024: 0
- 2025: 5
- 2026: 13
earlier: 5
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Gravity Forms <= 2.9.30 - Reflected Cross-Site Scripting via 'form_ids' Parameter this entry
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