CVE-2026-49777: CVSS 10 Flaw in WooCommerce Product Slider Pro Enables Malware Implantation

CVE-2026-49777: Critical WooCommerce Plugin Flaw Allows Malicious Software Implantation

A maximum-severity vulnerability has been disclosed affecting Product Slider Pro for WooCommerce, a widely used WordPress plugin developed by ShapedPlugin, LLC. Tracked as CVE-2026-49777 and assigned a CVSS score of 10.0, the flaw stems from improper validation of specified quantity in input, which can be exploited to implant malicious software on affected WordPress installations.

The vulnerability affects all versions before 3.5.3. A vendor-applied fix is available — site administrators should update immediately.

Vulnerability Overview

Technical Analysis

The vulnerability is rooted in improper validation of specified quantity in input — a class of flaw where the plugin fails to enforce limits or sanitize quantity-related parameters before they are processed by server-side logic. In the context of WooCommerce product slider components, this type of validation failure can be leveraged to manipulate the plugin's code execution path in a way that allows an attacker to introduce and execute malicious software on the WordPress server.

This class of vulnerability — when rated CVSS 10.0 — typically involves:

• No authentication requirement for exploitation
• No user interaction required
• Full impact across confidentiality, integrity, and availability dimensions
• Network-reachable attack surface accessible without local access

Given the CVSS 10.0 rating and the stated outcome of "Malicious Software Implanted," this flaw should be treated as a critical, potentially unauthenticated remote code execution or plugin-level code injection vulnerability.

Attack Surface

Product Slider Pro for WooCommerce is a commercial plugin for WordPress that renders product carousels and sliders on WooCommerce-powered storefronts. As a front-end component with server-side rendering, it processes user-supplied or configuration-driven input in page rendering contexts.

A CVSS 10.0 rating for a plugin in this category implies:

1. The vulnerable input path is publicly accessible without requiring a logged-in session
2. Exploitation likely enables arbitrary code execution or file write on the server
3. Attackers can achieve persistent access by implanting backdoors, web shells, or malicious plugin code

Remediation

Update Product Slider Pro for WooCommerce

The fix is available in version 3.5.3. Update immediately via the WordPress admin dashboard or WP-CLI:

# Update via WP-CLI
wp plugin update product-slider-pro-for-woocommerce
 
# Verify the installed version
wp plugin get product-slider-pro-for-woocommerce --field=version

Or navigate to WordPress Admin → Plugins → Installed Plugins, locate Product Slider Pro for WooCommerce, and click Update Now if an update is available.

Post-Update Verification

After updating, verify no malicious files were introduced prior to patching:

# Scan WordPress files for recently modified PHP files
find /var/www/html/wp-content/ -name "*.php" -newer /var/www/html/wp-login.php -type f
 
# Check for unfamiliar admin accounts
wp user list --role=administrator --format=table
 
# Review recent file modifications in plugin directory
find /var/www/html/wp-content/plugins/ -mtime -7 -type f | sort

If Exploitation Is Suspected

If your site ran a vulnerable version and was publicly accessible:

1. Take the site offline or restrict access immediately
2. Restore from a clean backup taken before the vulnerability window
3. Scan all PHP files for web shells or injected code using tools like maldet or wordfence
4. Rotate all credentials: WordPress admin passwords, database credentials, FTP/SSH keys, API keys
5. Review server logs for unusual POST requests or file creation events

Detection Indicators

Monitor for signs of exploitation:

# Check for web shells in plugin directory
grep -r "eval(base64_decode" /var/www/html/wp-content/plugins/
grep -r "system($_" /var/www/html/wp-content/plugins/
grep -r "passthru(" /var/www/html/wp-content/plugins/
 
# Review access logs for suspicious POST traffic to plugin assets
grep "product-slider-pro" /var/log/nginx/access.log | grep "POST" | tail -50
 
# Check for recently created PHP files (potential web shells)
find /var/www/html -name "*.php" -newer /var/www/html/wp-config.php -not -path "*/cache/*"

Impact Assessment

Key Takeaways

1. CVE-2026-49777 is a CVSS 10.0 critical vulnerability in Product Slider Pro for WooCommerce allowing malicious software implantation
2. All versions before 3.5.3 are affected — the vendor has applied a fix in 3.5.3
3. Update immediately — do not delay patching a maximum-severity plugin vulnerability
4. If you ran a vulnerable version on a public-facing site, perform a full security audit of your WordPress installation
5. CVSS 10.0 implies unauthenticated, network-reachable exploitation — treat all affected sites as potentially compromised until verified clean

Sources

• CVE-2026-49777 — NIST NVD
• ShapedPlugin — Product Slider Pro for WooCommerce