CVE-2026-25420
📋 TL;DR
This CVE describes a Missing Authorization vulnerability in the MailerLite WordPress plugin that allows attackers to exploit incorrectly configured access control security levels. The vulnerability affects all versions up to and including 1.7.18, potentially allowing unauthorized access to functionality that should be restricted.
💻 Affected Systems
- MailerLite official-mailerlite-sign-up-forms 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 gain administrative access to the WordPress site, modify plugin settings, access subscriber data, or inject malicious code into sign-up forms.
Likely Case
Unauthorized users could modify MailerLite plugin settings, potentially redirecting form submissions or accessing subscriber email lists.
If Mitigated
With proper access controls and authentication checks, the vulnerability would be prevented from being exploited.
🎯 Exploit Status
Missing authorization vulnerabilities typically require minimal technical skill to exploit once the attack vector is identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.7.18
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'MailerLite' plugin. 4. Click 'Update Now' if available, or delete and reinstall latest version from WordPress repository.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the MailerLite plugin until patched
wp plugin deactivate official-mailerlite-sign-up-forms
Restrict admin access
allImplement IP whitelisting for WordPress admin area
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block unauthorized access attempts to MailerLite endpoints
- Enable detailed logging and monitoring for unauthorized access attempts to plugin functionality
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for MailerLite version numberCheck Version:
wp plugin list --name=official-mailerlite-sign-up-forms --field=versionVerify Fix Applied:
Verify plugin version is greater than 1.7.18 and test authorization controls on plugin endpoints📡 Detection & Monitoring
Log Indicators:
- Unauthorized POST requests to MailerLite plugin endpoints
- Failed authentication attempts followed by successful unauthorized access
Network Indicators:
- Unusual traffic patterns to /wp-content/plugins/official-mailerlite-sign-up-forms/ endpoints
SIEM Query:
source="wordpress.log" AND (uri_path="/wp-admin/admin-ajax.php" AND parameters CONTAINS "mailerlite") AND NOT user_role="administrator"