CVE-2024-53860
📋 TL;DR
This vulnerability in sp-php-email-handler allows attackers to specify arbitrary email recipients and inject user-provided content into confirmation emails, enabling spam, phishing, and malicious email campaigns from your server. All users of pre-release versions (alpha and beta) are affected. The vulnerability can damage domain reputation and lead to email blacklisting.
💻 Affected Systems
- sp-php-email-handler
⚠️ 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 use your server for large-scale spam/phishing campaigns, causing domain blacklisting, legal liability, and complete loss of email functionality.
Likely Case
Server used for moderate spam campaigns, leading to reputation damage, temporary email delivery issues, and potential abuse complaints.
If Mitigated
If proper email rate limiting and monitoring are in place, impact is limited to some spam emails before detection.
🎯 Exploit Status
Simple HTTP POST requests can trigger the vulnerability without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.0
Vendor Advisory: https://github.com/Spencer14420/SPEmailHandler-PHP/security/advisories/GHSA-mj5r-x73q-fjw6
Restart Required: No
Instructions:
1. Backup current installation. 2. Replace sp-php-email-handler files with version 1.0.0 from GitHub. 3. Test contact form functionality.
🧯 If You Can't Patch
- Disable the contact form entirely
- Implement external email validation service
🔍 How to Verify
Check if Vulnerable:
Check package version in composer.json or project files for pre-release versionsCheck Version:
grep -r 'sp-php-email-handler' composer.json || find . -name '*.php' -exec grep -l 'SPEmailHandler' {} \;Verify Fix Applied:
Confirm version 1.0.0 is installed and user-provided content is not in confirmation emails📡 Detection & Monitoring
Log Indicators:
- Unusual email volume from contact form
- Emails to unexpected recipients
- Multiple failed email attempts
Network Indicators:
- Spike in SMTP traffic
- Unusual POST requests to contact form endpoint
SIEM Query:
source="web_logs" AND (uri_path="/contact" OR uri_path="/submit") AND status=200 | stats count by src_ip