CVE-2025-49374
📋 TL;DR
This Server-Side Request Forgery (SSRF) vulnerability in the captcha.eu WordPress plugin allows attackers to make the server send unauthorized requests to internal systems. It affects all WordPress sites running captcha.eu plugin versions up to and including 1.0.61. Attackers can potentially access internal services that should not be exposed.
💻 Affected Systems
- captcha.eu 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 access internal admin panels, cloud metadata services, or other internal systems, potentially leading to data exfiltration, internal network reconnaissance, or further exploitation of internal services.
Likely Case
Attackers scan internal networks, access internal web applications, or interact with cloud metadata services to obtain credentials or sensitive information.
If Mitigated
With proper network segmentation and egress filtering, impact is limited to accessing only allowed external resources or specific internal services.
🎯 Exploit Status
Exploitation requires understanding of SSRF techniques and potentially authentication depending on plugin implementation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: > 1.0.61
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'captcha.eu' plugin. 4. Click 'Update Now' if update available. 5. If no update available, deactivate and remove plugin until patched version is released.
🔧 Temporary Workarounds
Network Egress Filtering
allImplement firewall rules to restrict outbound HTTP/HTTPS requests from web servers to only necessary external services.
Input Validation
allAdd server-side validation to reject URLs containing internal IP addresses, localhost, or cloud metadata endpoints.
🧯 If You Can't Patch
- Deactivate and remove the captcha.eu plugin immediately
- Implement web application firewall (WAF) rules to block SSRF patterns
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for captcha.eu version. If version is 1.0.61 or lower, you are vulnerable.Check Version:
wp plugin list --name=captcha.eu --field=versionVerify Fix Applied:
After updating, verify plugin version shows higher than 1.0.61 in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from web server to internal IP addresses
- Requests to cloud metadata endpoints (169.254.169.254, etc.)
- Multiple failed outbound connection attempts
Network Indicators:
- Web server making unexpected HTTP requests to internal services
- Traffic from web server to cloud metadata services
- Outbound requests to unusual ports from web server
SIEM Query:
source="web_server_logs" AND (dest_ip=10.* OR dest_ip=172.16.* OR dest_ip=192.168.* OR dest_ip=169.254.169.254) AND http_method IN ("GET", "POST")