Executive Summary
CVE-2025-9314 is a critical, unauthenticated arbitrary file upload vulnerability in the Developer Tools WordPress plugin (versions through 1.1.3), scored CVSS 9.8. The flaw lives in the plugin's bundled SWFUpload library — specifically /libs/swfupload/upload.php, which under certain conditions writes an attacker-supplied file straight to disk with no authentication, file-type, or content check.
CVSS Score: 9.8 (Critical)
Because SWFUpload enforces no restrictions on file extension or contents, a remote attacker can send a well-formed upload request and drop a PHP web shell directly into a web-accessible directory — no login, no user interaction, no privileges required.
Vulnerability Overview
| Attribute | Value |
|---|---|
| CVE ID | CVE-2025-9314 |
| CWE | CWE-434 (Unrestricted Upload of File with Dangerous Type) |
| CVSS Score | 9.8 (Critical) |
| Type | Unauthenticated Arbitrary File Upload |
| Attack Vector | Network (no authentication required) |
| Privileges Required | None |
| User Interaction | None |
| Assigner | WPScan |
Affected Versions
| Plugin | Affected Versions | Fixed Version |
|---|---|---|
| Developer Tools | ≤ 1.1.3 | None — plugin delisted |
The Developer Tools plugin has been removed from the official WordPress Plugin Directory, and no patched release is expected. Any site still running it is running unmaintained, vulnerable code by definition.
Attack Vector
1. Attacker locates a WordPress site with the Developer Tools plugin active
2. Attacker sends a crafted multipart request to /libs/swfupload/upload.php
3. The bundled SWFUpload handler saves the uploaded file with no validation
4. A malicious PHP web shell lands in a web-accessible directory
5. Attacker requests the shell directly over HTTP
6. Full server compromise — arbitrary PHP execution, database access, lateral movementImpact of Successful Exploitation
| Impact | Description |
|---|---|
| Remote Code Execution | Arbitrary PHP execution on the web server |
| Database Compromise | Full read/write via wp-config.php credentials |
| Data Exfiltration | Access to all site content and user data |
| Web Shell Persistence | Uploaded files survive core/plugin updates |
| Lateral Movement | Pivoting to neighboring sites on shared hosting |
| Malware Distribution | Serving malware or spam pages to site visitors |
Immediate Remediation
There is no patched version to update to. The only reliable fix is removal.
Step 1: Remove the Plugin Entirely
# Via WP-CLI
wp plugin deactivate developer-tools
wp plugin delete developer-toolsOr through WordPress admin: Plugins > Installed Plugins > Developer Tools > Deactivate > Delete.
Step 2: Scan for Existing Compromise
# Look for recently modified/created PHP files
find /path/to/wordpress/wp-content/ -name "*.php" -newer /path/to/wordpress/wp-includes/version.php -type f
# Check for common web shell signatures
grep -rl "eval\s*(base64_decode" /path/to/wordpress/wp-content/
grep -rl "system\s*(\|shell_exec\s*(\|passthru\s*(" /path/to/wordpress/wp-content/uploads/
# Verify WordPress core integrity
wp core verify-checksumsIf the Plugin Cannot Be Removed Immediately
- Block access to
/wp-content/plugins/developer-tools/libs/swfupload/at the web server or WAF level - Deploy a WAF rule blocking POST requests to any
swfuploadpath - Monitor access logs for suspicious POST traffic against the upload endpoint
Detection Indicators
| Indicator | Description |
|---|---|
POST requests to swfupload/upload.php | Exploitation attempts |
| Unexpected PHP files in uploads directories | Web shells dropped through the flaw |
Requests to newly created .php files | Attacker accessing an uploaded shell |
| Unusual outbound connections from the web server | Post-exploitation data exfiltration |
Post-Remediation Steps
- Confirm the plugin is fully removed, not just deactivated
- Scan the installation for web shells and unauthorized file changes
- Review admin accounts for unauthorized additions
- Rotate all credentials — WordPress admin, database, API keys
- Regenerate WordPress security keys with
wp config shuffle-salts - Deploy a WAF (Wordfence, Sucuri) for ongoing protection
- Audit installed plugins for other abandoned or delisted extensions