Gravity Forms <= 3.0.2 - Unauthenticated Arbitrary File Upload via State/Chunk Hash Confusion
The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.0.2. This is due to insufficient validation of multi-file upload chunk state in the GFAsyncUpload::upload() function, where public form state URL hashes can be reused as chunk continuation hashes and attacker-controlled temporary filenames are accepted before sanitization. This makes it possible for unauthenticated attackers, when a public form contains a File Upload field with Multiple Files enabled, to upload a valid PNG/PDF polyglot to an attacker-selected public .php or .html filename in the Gravity Forms temporary upload directory. This can lead to remote code execution on WordPress systems that use NGINX or other non .htaccess respecting web servers. NOTE: During installation and activation, the Gravity Forms plugin places a .htaccess file in this directory, which prevents this vulnerability from being exploited despite the PHP file being written to the temporary upload directory. In these cases where PHP execution is blocked, attacker-written HTML can result in stored same-origin cross-site scripting if a victim visits the generated file URL.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Gravity Forms | <= 3.0.2 | 3.0.3 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-434- Platform
- WordPress
- Package
Gravity Forms- Disclosed
- 01.09.2026
- Updated
- 11.10.2026 10:23
Sources and licenses
Wordfence Intelligence - d20b2d00-054e-4772-a5a5-b7b33063043c - 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
-
Gravity Forms <= 3.0.2 - Unauthenticated Arbitrary File Upload via State/Chunk Hash Confusion this entry
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