CVE-2023-28666
📋 TL;DR
The InPost Gallery WordPress plugin before version 2.2.2 contains a reflected cross-site scripting vulnerability in the 'imgurl' parameter. This allows authenticated attackers to inject malicious scripts that execute in victims' browsers when they visit a crafted URL. Only WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- InPost Gallery WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal administrator session cookies, perform actions as the victim, or redirect users to malicious sites.
Likely Case
Privilege escalation within WordPress, session hijacking of other authenticated users, or defacement of admin pages.
If Mitigated
Limited impact due to requiring authenticated access; proper user privilege management reduces attack surface.
🎯 Exploit Status
Exploitation requires authenticated access; reflected XSS is well-understood and easy to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.2
Vendor Advisory: https://wordpress.org/plugins/inpost-gallery/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'InPost Gallery' and click 'Update Now'. 4. Verify version shows 2.2.2 or higher.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the InPost Gallery plugin until patched
wp plugin deactivate inpost-gallery
Restrict user registration
allLimit new user accounts to reduce authenticated attack surface
🧯 If You Can't Patch
- Implement web application firewall rules to block XSS payloads in 'imgurl' parameter
- Apply principle of least privilege to all WordPress user accounts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Installed Plugins for InPost Gallery versionCheck Version:
wp plugin get inpost-gallery --field=versionVerify Fix Applied:
Confirm plugin version is 2.2.2 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing suspicious script tags in 'imgurl' parameter
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unusual outbound connections from WordPress server after authenticated sessions
SIEM Query:
source="wordpress" AND (uri="*imgurl=*script*" OR uri="*imgurl=*javascript:*")