CVE-2025-31020
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Simple Spoiler WordPress plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the injected content, the scripts execute in their browsers, potentially stealing session cookies or performing unauthorized actions. All WordPress sites using Simple Spoiler versions up to 1.4 are affected.
💻 Affected Systems
- Webliberty Simple Spoiler 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 session cookies, take over WordPress sites, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers inject malicious scripts that steal user session data or perform actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Exploitation requires contributor-level access or higher to inject malicious scripts into posts/pages. The vulnerability is publicly documented with technical details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Simple Spoiler plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and delete plugin, then install fresh version 1.5+ from WordPress repository.
🔧 Temporary Workarounds
Disable Simple Spoiler Plugin
allTemporarily deactivate the vulnerable plugin until patched version is available
wp plugin deactivate simple-spoiler
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
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 Simple Spoiler plugin completely and use alternative spoiler functionality
- Implement web application firewall (WAF) rules to block XSS payloads targeting the plugin
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Simple Spoiler → Version. If version is 1.4 or earlier, you are vulnerable.Check Version:
wp plugin get simple-spoiler --field=versionVerify Fix Applied:
After updating, verify Simple Spoiler version shows 1.5 or later in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to wp-admin containing script tags
- Multiple failed authentication attempts followed by successful contributor/admin login
Network Indicators:
- HTTP requests containing <script> tags in POST data to WordPress endpoints
- Outbound connections to suspicious domains from your WordPress server
SIEM Query:
source="wordpress.log" AND ("simple-spoiler" OR "spoiler") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")