CVE-2024-30527
📋 TL;DR
This vulnerability in the WP Express Checkout WordPress plugin allows attackers to manipulate hidden form fields, potentially enabling price manipulation during PayPal checkout. It affects all WordPress sites using the plugin version 2.3.7 or earlier. Attackers could exploit this to purchase items at unauthorized prices.
💻 Affected Systems
- Tips and Tricks HQ WP Express Checkout (Accept PayPal Payments)
⚠️ 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.
- 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
Attackers purchase high-value products at minimal cost, causing significant financial loss to merchants and potentially enabling inventory depletion attacks.
Likely Case
Attackers purchase discounted items at even lower prices, causing moderate financial loss and undermining pricing integrity.
If Mitigated
With proper input validation and price verification on the server side, impact is limited to failed transaction attempts.
🎯 Exploit Status
Exploitation requires no authentication and involves simple form field manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.8 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/wp-express-checkout/wordpress-wp-express-checkout-plugin-2-3-7-price-manipulation-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'WP Express Checkout' and click 'Update Now'. 4. Verify version is 2.3.8 or higher.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched.
wp plugin deactivate wp-express-checkout
Implement Server-Side Price Validation
allAdd custom server-side validation to verify prices match product catalog.
Add custom PHP validation in theme functions.php or custom plugin
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block suspicious price parameter modifications
- Enable transaction logging and monitoring for price anomalies
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for WP Express Checkout version 2.3.7 or lower.Check Version:
wp plugin get wp-express-checkout --field=versionVerify Fix Applied:
Verify plugin version is 2.3.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual price discrepancies in transaction logs
- Multiple failed price validation attempts
Network Indicators:
- POST requests with modified price parameters to checkout endpoints
SIEM Query:
source="wordpress" AND (uri_path="/checkout" OR uri_path="/paypal") AND (price<product_price OR price_parameter_modified=true)🔗 References
- https://patchstack.com/database/vulnerability/wp-express-checkout/wordpress-wp-express-checkout-plugin-2-3-7-price-manipulation-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/wp-express-checkout/wordpress-wp-express-checkout-plugin-2-3-7-price-manipulation-vulnerability?_s_id=cve
