CVE-2025-12094
📋 TL;DR
The OOPSpam Anti-Spam WordPress plugin is vulnerable to IP header spoofing, allowing unauthenticated attackers to bypass IP-based security controls like blocked lists and rate limiting. This affects all WordPress sites using the plugin up to version 1.2.53. Attackers can forge their IP address by manipulating HTTP headers.
💻 Affected Systems
- OOPSpam Anti-Spam: Spam Protection for WordPress Forms & Comments (No CAPTCHA)
⚠️ 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 bypass all IP-based protections, enabling spam campaigns, brute force attacks, and evasion of IP blacklists with no authentication required.
Likely Case
Spammers bypass rate limiting and IP blocking to submit spam comments and form submissions, potentially overwhelming the site.
If Mitigated
With proper proxy verification or patching, IP-based controls function correctly, blocking malicious traffic as intended.
🎯 Exploit Status
Exploitation requires sending crafted HTTP headers, which is trivial with tools like curl or Burp Suite.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 1.2.53
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3386104/oopspam-anti-spam/trunk/include/helpers.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find OOPSpam Anti-Spam and click 'Update Now'. 4. Verify update to version after 1.2.53.
🔧 Temporary Workarounds
Disable Plugin
WordPressTemporarily deactivate the OOPSpam plugin until patched.
wp plugin deactivate oopspam-anti-spam
Web Server Header Filtering
allConfigure web server (e.g., Apache, Nginx) to strip or ignore suspicious forwarded headers.
Nginx: add 'proxy_set_header X-Forwarded-For $remote_addr;' in config
Apache: use mod_headers to remove or validate headers
🧯 If You Can't Patch
- Implement network-level IP filtering via WAF or firewall rules to block malicious IPs independently.
- Use alternative spam protection plugins with proper IP validation until patch is applied.
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins > Installed Plugins. If version is 1.2.53 or lower, it is vulnerable.Check Version:
wp plugin get oopspam-anti-spam --field=versionVerify Fix Applied:
After update, confirm plugin version is above 1.2.53 and test by sending requests with spoofed headers to verify they are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual spikes in form submissions or comments from single IPs
- HTTP requests containing CF-Connecting-IP, X-Forwarded-For headers from untrusted sources
Network Indicators:
- Traffic with spoofed IP headers bypassing rate limits
- Increased requests from IPs on blocklists
SIEM Query:
source="web_logs" AND (http_header="CF-Connecting-IP" OR http_header="X-Forwarded-For") AND action="bypass"🔗 References
- https://plugins.trac.wordpress.org/browser/oopspam-anti-spam/tags/1.2.49/include/helpers.php#L268
- https://plugins.trac.wordpress.org/changeset/3386104/oopspam-anti-spam/trunk/include/helpers.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b5137bc2-912b-4e25-966e-515e8d9fc21c?source=cve
