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CVE-2026-19513— Gravity Forms <= 3.0.2 - Unauthenticated Arbitrary File Upload via State/Chunk Hash Confusion

Quick assessment

Affected
Gravity Forms Gravity Forms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 Gravity Forms 插件在 3.0.2 及更早的所有版本中均存在任意文件上传漏洞。该漏洞源于 函数中对多文件上传的分块状态校验不足：公开表单的状态 URL 哈希值可被复用作为分块续传哈希，且攻击者可控的临时文件名在净化之前即被接受。因此，当公开表单启用了“多文件”选项的文件上传字段时，未认证的攻击者可以将一个有效的 PNG/PDF 混合文件（polyglot）以攻击者选定的公开 或 文件名上传到 Gravity Forms 的临时上传目录。这在使用 NGINX 或其他不解析 文件的

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Gravity Forms Gravity Forms ≤ 3.0.2 affected
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I. Basic Information for CVE-2026-19513

Vulnerability Information
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Vulnerability Title
Gravity Forms <= 3.0.2 - Unauthenticated Arbitrary File Upload via State/Chunk Hash Confusion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gravity Forms Gravity Forms 0 ~ 3.0.2 -

II. Public POCs for CVE-2026-19513

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III. Intelligence Information for CVE-2026-19513

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Vendor Advisories for CVE-2026-19513 (1)

IV. Related Vulnerabilities

Same product: Gravity Forms
Same vendor: Gravity Forms
Same weakness: CWE-434

V. Comments for CVE-2026-19513

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