CVE-2026-1843
📋 TL;DR
The Super Page Cache WordPress plugin has a stored cross-site scripting vulnerability in its Activity Log feature. Unauthenticated attackers can inject malicious scripts that execute when users view compromised pages. All WordPress sites using this plugin up to version 5.2.2 are affected.
💻 Affected Systems
- Super Page Cache 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 admin credentials, deface websites, redirect users to malicious sites, or install backdoors leading to complete site compromise.
Likely Case
Attackers inject malicious scripts to steal user session cookies, redirect to phishing pages, or display unwanted content.
If Mitigated
With proper web application firewalls and content security policies, script execution could be blocked, limiting impact to script injection without execution.
🎯 Exploit Status
The vulnerability is well-documented with public proof-of-concept available. Attackers can exploit without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.2.3 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3454474/wp-cloudflare-page-cache
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Super Page Cache plugin. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 5.2.3+ from WordPress repository.
🔧 Temporary Workarounds
Disable Activity Log Feature
allTemporarily disable the vulnerable Activity Log component until patching is possible.
Edit wp-config.php and add: define('SUPER_PAGE_CACHE_DISABLE_ACTIVITY_LOG', true);
Implement Content Security Policy
linuxAdd CSP headers to prevent script execution from untrusted sources.
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Or add to Nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self'";
🧯 If You Can't Patch
- Disable the Super Page Cache plugin entirely until patched
- Implement a web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Super Page Cache version. If version is 5.2.2 or lower, you are vulnerable.Check Version:
wp plugin list --name='Super Page Cache' --field=versionVerify Fix Applied:
After updating, verify plugin version shows 5.2.3 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to activity log endpoints
- Suspicious script tags in activity log entries
- Multiple failed XSS attempts in web server logs
Network Indicators:
- Unusual traffic patterns to /wp-content/plugins/wp-cloudflare-page-cache/
- Script injection attempts in HTTP requests
SIEM Query:
source="web_logs" AND (uri_path="/wp-content/plugins/wp-cloudflare-page-cache/" OR user_agent CONTAINS "script")