CVE-2024-56246
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into web pages generated by the Nexter Blocks WordPress plugin, potentially leading to DOM-based cross-site scripting (XSS). It affects users of the Nexter Blocks plugin from unspecified versions through 4.0.4, enabling unauthorized actions like stealing session cookies or redirecting users to malicious sites.
💻 Affected Systems
- POSIMYTH Nexter Blocks (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 steal sensitive user data (e.g., login credentials), perform actions on behalf of users, or deface websites, leading to data breaches and reputational damage.
Likely Case
Attackers exploit the vulnerability to hijack user sessions, redirect users to phishing sites, or inject ads, causing minor disruptions and potential data theft.
If Mitigated
With proper input validation and output encoding, the risk is reduced to minimal, preventing script execution and limiting impact to negligible levels.
🎯 Exploit Status
XSS vulnerabilities are often easy to exploit with basic web knowledge, but no public proof-of-concept has been identified for this specific CVE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.0.4
Restart Required: No
Instructions:
1. Log into the WordPress admin dashboard. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Nexter Blocks' and check for updates. 4. If an update is available, click 'Update Now' to install version 4.0.5 or later. 5. Verify the update completes successfully.
🔧 Temporary Workarounds
Disable the Nexter Blocks Plugin
allTemporarily deactivate the plugin to prevent exploitation until a patch can be applied.
wp plugin deactivate nexter-blocks
Implement Content Security Policy (CSP)
allAdd a CSP header to restrict script execution, reducing the impact of XSS attacks.
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to your web server configuration (e.g., in .htaccess for Apache or nginx.conf).
🧯 If You Can't Patch
- Monitor web server logs for suspicious activity, such as unusual script injections or unexpected redirects.
- Restrict plugin access to trusted users only and implement web application firewalls (WAFs) to block malicious inputs.
🔍 How to Verify
Check if Vulnerable:
Check the plugin version in WordPress admin under Plugins > Installed Plugins; if 'Nexter Blocks' is version 4.0.4 or earlier, it is vulnerable.Check Version:
wp plugin get nexter-blocks --field=versionVerify Fix Applied:
After updating, confirm the plugin version is 4.0.5 or later in the same location and test for XSS by attempting to inject scripts in user inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual POST or GET requests with script tags or JavaScript code in parameters, especially to pages using the Nexter Blocks plugin.
Network Indicators:
- HTTP requests containing malicious payloads like <script>alert('XSS')</script> targeting the plugin endpoints.
SIEM Query:
source="web_logs" AND (url="*nexter-blocks*" AND (payload="*<script>*" OR payload="*javascript:*"))