CVE-2025-28870
📋 TL;DR
This DOM-based Cross-Site Scripting (XSS) vulnerability in amoCRM WebForm allows attackers to inject malicious scripts into web pages viewed by other users. It affects WordPress sites using the amoCRM WebForm plugin versions up to 1.1. Attackers can steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- amoCRM WebForm WordPress Plugin
📦 What is this software?
Amocrm by Amocrm
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of WordPress site, install backdoors, deface website, or steal sensitive customer data from CRM forms.
Likely Case
Attackers steal user session cookies, redirect users to phishing sites, or perform limited actions within the user's context on the affected site.
If Mitigated
With proper Content Security Policy (CSP) headers and input validation, impact is limited to script execution within the specific vulnerable component only.
🎯 Exploit Status
DOM-based XSS typically requires user interaction but can be exploited via crafted links or forms.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'amoCRM WebForm' and click 'Update Now'. 4. Verify version is 1.2 or higher.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate amocrm-webform
Implement CSP Headers
allAdd Content Security Policy headers to limit script execution
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
- Disable the amoCRM WebForm plugin completely
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > amoCRM WebForm version. If version is 1.1 or lower, you are vulnerable.Check Version:
wp plugin get amocrm-webform --field=versionVerify Fix Applied:
Verify plugin version is 1.2 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST/GET requests to amoCRM WebForm endpoints with script tags
- Multiple failed login attempts following suspicious form submissions
Network Indicators:
- HTTP requests containing <script> tags or javascript: URIs to plugin endpoints
- Outbound connections to suspicious domains following form submissions
SIEM Query:
source="web_server" AND (uri_path="/wp-content/plugins/amocrm-webform/" AND (request_body CONTAINS "<script>" OR request_body CONTAINS "javascript:"))