CVE-2024-35718
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into web pages generated by the Tribulant Newsletters WordPress plugin. When users view these pages, the scripts execute in their browsers, potentially stealing session cookies or performing actions on their behalf. It affects all WordPress sites using the Newsletters plugin versions up to 4.9.5.
💻 Affected Systems
- Tribulant Newsletters WordPress Plugin
📦 What is this software?
Newsletters by Tribulant
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, take over WordPress sites, install backdoors, or redirect users to malicious sites.
Likely Case
Attackers steal user session cookies or credentials, perform actions as authenticated users, or deface parts of the site.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly exploited and require minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.9.6 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Newsletters' plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 4.9.6+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Input Validation Filter
allAdd custom input validation to sanitize user inputs before processing.
Add sanitization filters in WordPress theme functions.php or custom plugin
Content Security Policy
allImplement CSP headers to restrict script execution sources.
Add 'Content-Security-Policy' header via .htaccess or web server config
🧯 If You Can't Patch
- Disable the Newsletters plugin immediately
- Implement web application firewall rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for Newsletters plugin version 4.9.5 or earlier.Check Version:
wp plugin get newsletters --field=version (if WP-CLI installed)Verify Fix Applied:
Confirm plugin version is 4.9.6 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests with script tags or JavaScript in parameters
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing <script>, javascript:, or encoded XSS payloads in URL parameters
SIEM Query:
web.url:*<script>* OR web.url:*javascript:* OR web.url:*%3Cscript%3E*🔗 References
- https://patchstack.com/database/vulnerability/newsletters-lite/wordpress-newsletters-plugin-4-9-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/newsletters-lite/wordpress-newsletters-plugin-4-9-5-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve
