CVE-2024-35655
📋 TL;DR
This stored XSS vulnerability in the Brave Popup Builder WordPress plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the malicious content, their browsers execute the scripts, potentially compromising their sessions or stealing sensitive data. All WordPress sites using Brave Popup Builder versions up to 0.6.9 are affected.
💻 Affected Systems
- Brave Popup Builder (WordPress plugin)
📦 What is this software?
Brave by Getbrave
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, take over WordPress sites, deface websites, or redirect users to malicious sites, potentially leading to complete site compromise and data theft.
Likely Case
Attackers inject malicious JavaScript that steals user session cookies or credentials, allowing them to impersonate users or administrators with limited privileges.
If Mitigated
With proper input validation and output encoding, malicious scripts are neutralized before reaching users, preventing any exploitation.
🎯 Exploit Status
The vulnerability requires some level of access to inject malicious content, but once injected, exploitation is straightforward. Public proof-of-concept details are available through security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.6.10 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Brave Popup Builder. 4. Click 'Update Now' if available. 5. Alternatively, download version 0.6.10+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the Brave Popup Builder plugin until patched
wp plugin deactivate brave-popup-builder
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to nginx config: add_header Content-Security-Policy "default-src 'self'; script-src 'self'";
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Restrict plugin access to trusted users only and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Brave Popup Builder for version number. If version is 0.6.9 or lower, you are vulnerable.Check Version:
wp plugin get brave-popup-builder --field=versionVerify Fix Applied:
After updating, verify plugin version shows 0.6.10 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints containing script tags or JavaScript
- Multiple failed login attempts followed by plugin configuration changes
Network Indicators:
- Outbound connections to suspicious domains from your WordPress server
- Unexpected JavaScript payloads in HTTP responses
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" OR uri_path CONTAINS "brave-popup") AND (http_method="POST" AND (request_body CONTAINS "<script>" OR request_body CONTAINS "javascript:"))🔗 References
- https://patchstack.com/database/vulnerability/brave-popup-builder/wordpress-brave-interactive-content-plugin-0-6-8-cross-site-scripting-xss-vulnerability?_s_id=cve
- https://patchstack.com/database/vulnerability/brave-popup-builder/wordpress-brave-interactive-content-plugin-0-6-8-cross-site-scripting-xss-vulnerability?_s_id=cve
