CVE-2023-30489
📋 TL;DR
Unauthenticated reflected cross-site scripting (XSS) vulnerability in the I Thirteen Web Solution Email Subscription Popup WordPress plugin allows attackers to inject malicious scripts via crafted URLs. This affects WordPress sites running plugin versions 1.2.16 and earlier. Attackers can execute arbitrary JavaScript in victims' browsers when they visit malicious links.
💻 Affected Systems
- I Thirteen Web Solution Email Subscription Popup WordPress Plugin
📦 What is this software?
Email Subscription Popup by I13websolution
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, take over WordPress sites, install backdoors, or redirect users to malicious sites, potentially leading to complete site compromise and data theft.
Likely Case
Attackers steal user session cookies, perform actions on behalf of authenticated users, deface websites, or redirect users to phishing pages.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized, preventing execution in user browsers.
🎯 Exploit Status
Exploitation requires tricking users into clicking malicious links. Public proof-of-concept demonstrates the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.17 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Email Subscription Popup' plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download version 1.2.17+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched.
wp plugin deactivate email-subscription-popup
Web Application Firewall (WAF)
allConfigure WAF to block XSS payloads in URL parameters.
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution sources.
- Use browser security features like HttpOnly and Secure flags for cookies to limit impact.
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for 'Email Subscription Popup' version.Check Version:
wp plugin get email-subscription-popup --field=versionVerify Fix Applied:
Verify plugin version is 1.2.17 or later in WordPress admin.📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters containing script tags or JavaScript in web server logs
- Multiple failed XSS attempts in security logs
Network Indicators:
- HTTP requests with suspicious parameters like <script> tags in URLs
- Unexpected redirects to external domains
SIEM Query:
source="web_server_logs" AND (url="*<script>*" OR url="*javascript:*")🔗 References
- https://patchstack.com/database/vulnerability/email-subscribe/wordpress-email-subscription-popup-plugin-1-2-16-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/email-subscribe/wordpress-email-subscription-popup-plugin-1-2-16-cross-site-scripting-xss-vulnerability?_s_id=cve
