CVE-2025-31819
📋 TL;DR
This Cross-site Scripting (XSS) vulnerability in the Nova Blocks WordPress plugin allows attackers to inject malicious scripts into web pages. Users who visit compromised pages can have their sessions hijacked or be redirected to malicious sites. All WordPress sites using Nova Blocks by Pixelgrade versions up to 2.1.8 are affected.
💻 Affected Systems
- Nova Blocks by Pixelgrade 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 administrator credentials, take over WordPress sites, install backdoors, or redirect visitors to phishing/malware sites.
Likely Case
Session hijacking, cookie theft, defacement of website content, or redirection to malicious advertisements.
If Mitigated
Limited impact if proper Content Security Policy (CSP) headers are implemented and user input validation is enforced elsewhere.
🎯 Exploit Status
XSS vulnerabilities in WordPress plugins are commonly exploited. The Patchstack reference provides technical details about the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.9 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Go to Plugins → Installed Plugins. 3. Find 'Nova Blocks by Pixelgrade'. 4. Click 'Update Now' if available. 5. Alternatively, download version 2.1.9+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Disable Nova Blocks Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate nova-blocks
Implement Content Security Policy
allAdd CSP headers to mitigate XSS impact
Add 'Content-Security-Policy: default-src 'self'' to web server configuration
🧯 If You Can't Patch
- Remove Nova Blocks plugin completely if not essential
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins. If Nova Blocks version is 2.1.8 or lower, you are vulnerable.Check Version:
wp plugin get nova-blocks --field=versionVerify Fix Applied:
After updating, verify Nova Blocks version shows 2.1.9 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests containing script tags to Nova Blocks endpoints
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests with malicious script payloads in parameters
- Unexpected redirects from Nova Blocks pages
SIEM Query:
source="web_logs" AND (uri_path="/wp-json/nova-blocks" OR uri_path="/wp-admin/admin-ajax.php") AND (http_method="POST" OR http_method="GET") AND (query_string CONTAINS "<script>" OR query_string CONTAINS "javascript:")