CVE-2025-5528
📋 TL;DR
This vulnerability allows unauthenticated attackers to inject malicious scripts via the heateor_mastodon_share parameter in WordPress Social Sharing Plugin. When users click specially crafted links, arbitrary JavaScript executes in their browsers. All WordPress sites using Sassy Social Share plugin versions up to 3.3.75 are affected.
💻 Affected Systems
- Sassy Social Share WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, perform actions on behalf of users, or deliver malware payloads through the compromised WordPress site.
Likely Case
Attackers will typically use this to steal session cookies or redirect users to phishing pages, potentially compromising user accounts on the affected WordPress site.
If Mitigated
With proper Content Security Policy headers and modern browser XSS protections, impact is limited to the specific vulnerable page and parameter.
🎯 Exploit Status
Exploitation requires tricking users into clicking malicious links but requires no authentication or special privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.76 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3200000/sassy-social-share
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Sassy Social Share plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download version 3.3.76+ from WordPress plugin repository and manually update.
🔧 Temporary Workarounds
Disable vulnerable parameter via .htaccess
linuxBlock access to the vulnerable parameter at web server level
RewriteEngine On
RewriteCond %{QUERY_STRING} heateor_mastodon_share [NC]
RewriteRule ^ - [F]
Temporarily disable plugin
linuxDeactivate Sassy Social Share plugin until patched
wp plugin deactivate sassy-social-share
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to limit script execution
- Use web application firewall rules to block requests containing script tags in the heateor_mastodon_share parameter
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Sassy Social Share version. If version is 3.3.75 or lower, you are vulnerable.Check Version:
wp plugin get sassy-social-share --field=versionVerify Fix Applied:
After updating, verify plugin version shows 3.3.76 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing 'heateor_mastodon_share' parameter with script tags or JavaScript code
- Unusual referrer patterns from malicious links
Network Indicators:
- Outbound connections to suspicious domains following visits to pages with heateor_mastodon_share parameter
SIEM Query:
source="web_logs" AND "heateor_mastodon_share" AND ("<script" OR "javascript:" OR "onload=" OR "onerror=")