CVE-2026-1499 – The WP Duplicate plugin for WordPress has a cri... (How to Fix)

Q: What is the severity of CVE-2026-1499?

CVE-2026-1499 has a CVSS score of 9.8 (CRITICAL). The WP Duplicate plugin for WordPress has a critical vulnerability that allows authenticated attackers with subscriber-level access to upload arbitrary files to the server, leading to remote code execution. This occurs due to missing authorization checks and path traversal issues. All WordPress sites using WP Duplicate plugin versions up to 1.1.8 are affected.

📋 TL;DR

The WP Duplicate plugin for WordPress has a critical vulnerability that allows authenticated attackers with subscriber-level access to upload arbitrary files to the server, leading to remote code execution. This occurs due to missing authorization checks and path traversal issues. All WordPress sites using WP Duplicate plugin versions up to 1.1.8 are affected.

💻 Affected Systems

Products:

WP Duplicate WordPress plugin

Versions: All versions up to and including 1.1.8

Operating Systems: All operating systems running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with WP Duplicate plugin enabled. Any authenticated user (even subscriber role) can trigger the vulnerability.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:

Review the CVE details at NVD
Check vendor security advisories for your specific version
Test if the vulnerability is exploitable in your environment
Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete server compromise leading to data theft, defacement, malware distribution, or ransomware deployment.

🟠

Likely Case

Website defacement, backdoor installation, credential theft, and lateral movement within the hosting environment.

🟢

If Mitigated

Limited impact if file uploads are restricted, web application firewalls block malicious requests, and proper file permissions are enforced.

🌐 Internet-Facing: HIGH - WordPress sites are typically internet-facing, making them directly accessible to attackers.

🏢 Internal Only: MEDIUM - Internal WordPress installations could still be exploited by compromised internal accounts or attackers who gain initial access.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access (subscriber role or higher). The vulnerability chain is well-documented in the CVE description, making weaponization likely.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.1.9 or later

Vendor Advisory: https://wordpress.org/plugins/local-sync/

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'WP Duplicate' or 'Local Sync' plugin. 4. Click 'Update Now' if available. 5. If no update is available, deactivate and delete the plugin immediately.

🔧 Temporary Workarounds

Disable WP Duplicate Plugin

all

Temporarily disable the vulnerable plugin until patched

wp plugin deactivate local-sync

Restrict File Uploads

all

Configure web server to block file uploads to vulnerable endpoints

# Add to .htaccess for Apache:
<LocationMatch "\/wp-admin\/admin-ajax\.php\?action=process_add_site">
    Deny from all
</LocationMatch>
# Add to nginx config:
location ~* \/wp-admin\/admin-ajax\.php\?action=process_add_site {
    deny all;
}

🧯 If You Can't Patch

Remove all subscriber-level user accounts or restrict their capabilities
Implement web application firewall rules to block requests to the vulnerable AJAX endpoint

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Installed Plugins for 'WP Duplicate' or 'Local Sync' plugin version 1.1.8 or earlier

Check Version:

wp plugin list --name=local-sync --field=version

Verify Fix Applied:

Verify plugin version is 1.1.9 or later, or confirm plugin is deactivated/removed

📡 Detection & Monitoring

Log Indicators:

POST requests to /wp-admin/admin-ajax.php with action=process_add_site
File uploads to unusual directories via wp-content/plugins/local-sync/
Unauthorized file write operations in web server logs

Network Indicators:

HTTP POST requests containing prod_key_random_id parameter
Unusual file upload patterns to plugin directories

SIEM Query:

source="web_server_logs" AND (uri_path="/wp-admin/admin-ajax.php" AND query_string="*action=process_add_site*" OR uri_path="*/wp-content/plugins/local-sync/*" AND method="POST")

📊 Metadata

CVE ID: CVE-2026-1499

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-862

EPSS Score: 1.47% exploit probability (80.6th percentile)

Published: February 6, 2026

Last Updated: February 6, 2026

🔗 References

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