CVE-2021-25010
📋 TL;DR
This vulnerability in the Post Snippets WordPress plugin allows attackers to trick logged-in administrators into importing malicious code snippets without their consent. The imported snippets aren't properly sanitized, enabling stored cross-site scripting attacks that can compromise admin sessions and website visitors. WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- Post Snippets WordPress Plugin
📦 What is this software?
Post Snippets by Postsnippets
⚠️ Risk & Real-World Impact
Worst Case
Complete site takeover through admin session hijacking, data theft, malware injection, and website defacement affecting all visitors.
Likely Case
Stored XSS payloads executed in admin context leading to privilege escalation, backdoor installation, or credential theft.
If Mitigated
Limited impact with proper CSRF protections and input validation in place, potentially no successful exploitation.
🎯 Exploit Status
Exploitation requires social engineering to trick admin into clicking malicious link while authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.4
Vendor Advisory: https://wpscan.com/vulnerability/d1ebd15a-72ab-4ba2-a212-7e2eea0b0fb0
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Post Snippets plugin. 4. Click 'Update Now' if available, or download version 3.1.4+ from WordPress repository. 5. Activate updated plugin.
🔧 Temporary Workarounds
Disable Post Snippets Plugin
allTemporarily deactivate the vulnerable plugin until patching is possible
wp plugin deactivate post-snippets
Implement CSRF Protection
allAdd custom CSRF tokens to plugin import functionality via custom code
🧯 If You Can't Patch
- Restrict admin access to trusted networks only
- Implement web application firewall with XSS and CSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Post Snippets → Version. If version is below 3.1.4, system is vulnerable.Check Version:
wp plugin get post-snippets --field=versionVerify Fix Applied:
Confirm Post Snippets plugin version is 3.1.4 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- POST requests to /wp-admin/admin.php?page=post-snippets&action=import without referrer validation
- Unexpected snippet imports in plugin logs
Network Indicators:
- CSRF attack patterns targeting admin import endpoints
- Malicious JavaScript payloads in HTTP requests
SIEM Query:
source="wordpress.log" AND ("post-snippets" AND "import") AND NOT referrer="*wp-admin*"