CVE-2025-23693
📋 TL;DR
This CSRF vulnerability in the Secure CAPTCHA WordPress plugin allows attackers to trick authenticated administrators into executing actions that inject malicious scripts. When exploited, it leads to stored XSS, affecting all WordPress sites using vulnerable plugin versions. The vulnerability requires an authenticated admin session to be exploited.
💻 Affected Systems
- Secure CAPTCHA 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 inject persistent malicious scripts that steal admin credentials, deface websites, or redirect visitors to malicious sites, potentially compromising the entire WordPress installation and user data.
Likely Case
Attackers would typically use this to inject advertising scripts, cryptocurrency miners, or redirect scripts that generate revenue through malicious traffic.
If Mitigated
With proper CSRF tokens and input validation, the vulnerability would be prevented entirely, though the underlying XSS vector might still exist in other contexts.
🎯 Exploit Status
Exploitation requires tricking an authenticated admin into clicking a malicious link while logged in. The CSRF leads to stored XSS payload injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Secure CAPTCHA plugin. 4. Click 'Update Now' if available. 5. If no update appears, manually download version 1.3+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable Plugin
WordPressTemporarily disable the vulnerable plugin until patched
wp plugin deactivate secure-captcha
Implement CSRF Protection
WordPressAdd custom CSRF tokens to plugin forms via custom code
🧯 If You Can't Patch
- Remove the Secure CAPTCHA plugin entirely and use alternative CAPTCHA solutions
- Implement web application firewall rules to block suspicious POST requests to admin-ajax.php involving the plugin
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Installed Plugins for Secure CAPTCHA version. If version is 1.2 or earlier, you are vulnerable.Check Version:
wp plugin get secure-captcha --field=versionVerify Fix Applied:
After updating, verify plugin version shows 1.3 or later in WordPress admin plugins page.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to admin-ajax.php with plugin-specific actions
- Multiple failed CAPTCHA submissions from same IP
- JavaScript injection in plugin settings or database
Network Indicators:
- HTTP requests containing 'secure-captcha' action parameters without proper referrer headers
- Suspicious iframe or script tags in plugin-generated content
SIEM Query:
source="wordpress.log" AND ("admin-ajax.php" AND "secure-captcha") AND (status=200 OR status=302)