CVE-2026-19513— Gravity Forms 3.0.2 任意文件上传漏洞
一分钟漏洞结论
影响对象
Gravity Forms Gravity Forms
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Gravity Forms | Gravity Forms | ≤ 3.0.2 |
affected |
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一、 漏洞 CVE-2026-19513 基础信息
漏洞信息
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Vulnerability Title
Gravity Forms <= 3.0.2 - Unauthenticated Arbitrary File Upload via State/Chunk Hash Confusion
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Gravity Forms | Gravity Forms | 0 ~ 3.0.2 | - |
|
二、漏洞 CVE-2026-19513 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-19513 厂商安全公告 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-19513
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