CVE-2025-23868
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Chess Tempo Viewer WordPress plugin allows attackers to inject malicious scripts into web pages. When users view affected pages, the scripts execute in their browsers, potentially stealing credentials or performing unauthorized actions. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- WordPress Chess Tempo Viewer 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, deface websites, or redirect users to malicious sites, potentially leading to complete site compromise.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, perform actions as authenticated users, or redirect users to phishing pages.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited, though specific exploit details for this CVE are not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.9.6 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Chess Tempo Viewer' and click 'Update Now'. 4. Verify plugin version is 0.9.6 or higher.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate chesstempoviewer
Content Security Policy
allImplement CSP headers to restrict script execution
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to wp-config.php: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Remove the Chess Tempo Viewer plugin entirely
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for Chess Tempo Viewer versionCheck Version:
wp plugin get chesstempoviewer --field=versionVerify Fix Applied:
Verify plugin version is 0.9.6 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Suspicious JavaScript in database entries
- Multiple failed XSS attempts in web server logs
Network Indicators:
- Malicious script tags in HTTP requests
- Suspicious characters like <script> in URL parameters
SIEM Query:
source="*access.log*" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=") AND "wp-content/plugins/chesstempoviewer"