CVE-2023-48276
📋 TL;DR
This vulnerability allows attackers to bypass the CAPTCHA protection in the WP Forms Puzzle Captcha WordPress plugin by making excessive authentication attempts without proper rate limiting. It affects all WordPress sites using this plugin from any version up to 4.1, potentially enabling spam form submissions or automated attacks.
💻 Affected Systems
- Nitin Rathod WP Forms Puzzle Captcha WordPress Plugin
⚠️ 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 could bypass CAPTCHA protection entirely, enabling automated spam form submissions, credential stuffing attacks on protected forms, or brute force attacks against authentication mechanisms that rely on this CAPTCHA.
Likely Case
Automated bots bypass CAPTCHA to submit spam through contact forms, registration forms, or comment forms protected by this plugin, potentially leading to spam content, fake user registrations, or form abuse.
If Mitigated
With proper network controls and monitoring, impact is limited to potential spam submissions that can be filtered and managed through other means.
🎯 Exploit Status
The vulnerability is straightforward to exploit as it involves sending repeated requests to bypass rate limiting. Automated tools could easily weaponize this for spam campaigns.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.2 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/wp-forms-puzzle-captcha/wordpress-wp-forms-puzzle-captcha-plugin-4-1-captcha-bypass-vulnerability
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'WP Forms Puzzle Captcha'. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 4.2+ from WordPress.org and replace the plugin files.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched, though this removes CAPTCHA protection entirely.
wp plugin deactivate wp-forms-puzzle-captcha
Web Application Firewall Rule
linuxImplement rate limiting at the WAF or web server level for form submission endpoints.
# Example nginx rate limiting: limit_req_zone $binary_remote_addr zone=formlimit:10m rate=10r/s;
# Then apply to location blocks with form submissions
🧯 If You Can't Patch
- Replace WP Forms Puzzle Captcha with an alternative CAPTCHA solution that has proper rate limiting.
- Implement server-side rate limiting for all form submission endpoints using web server configuration or a WAF.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for 'WP Forms Puzzle Captcha' version. If version is 4.1 or lower, the site is vulnerable.Check Version:
wp plugin get wp-forms-puzzle-captcha --field=versionVerify Fix Applied:
Verify the plugin version is 4.2 or higher in WordPress admin panel, and test form submissions to confirm CAPTCHA is working with rate limiting.📡 Detection & Monitoring
Log Indicators:
- Unusually high volume of form submissions from single IP addresses
- Multiple failed CAPTCHA attempts from same source
- Form submissions without proper CAPTCHA validation in logs
Network Indicators:
- High frequency POST requests to form submission endpoints
- Pattern of automated requests bypassing CAPTCHA challenges
SIEM Query:
source="wordpress.log" AND "wp-forms-puzzle-captcha" AND ("failed captcha" OR "form submission") | stats count by src_ip🔗 References
- https://patchstack.com/database/vulnerability/wp-forms-puzzle-captcha/wordpress-wp-forms-puzzle-captcha-plugin-4-1-captcha-bypass-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/wp-forms-puzzle-captcha/wordpress-wp-forms-puzzle-captcha-plugin-4-1-captcha-bypass-vulnerability?_s_id=cve
