CVE-2025-49923
📋 TL;DR
This DOM-based XSS vulnerability in Seriously Simple Podcasting WordPress plugin allows attackers to inject malicious scripts that execute in users' browsers when viewing compromised pages. It affects all WordPress sites using Seriously Simple Podcasting plugin versions up to and including 3.11.1. Attackers could steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- Seriously Simple Podcasting WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full control of WordPress site, install backdoors, deface website, or pivot to internal network.
Likely Case
Attackers steal user session cookies, redirect visitors to malicious sites, or perform limited actions within WordPress context.
If Mitigated
Script execution blocked by Content Security Policy or browser XSS filters, limiting damage to minor UI manipulation.
🎯 Exploit Status
DOM-based XSS requires specific user interaction or page states, making exploitation less straightforward than reflected XSS.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 3.11.1
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Seriously Simple Podcasting. 4. Click 'Update Now' if available. 5. If no update shows, manually download latest version from WordPress repository. 6. Deactivate old plugin. 7. Upload and activate new version.
🔧 Temporary Workarounds
Content Security Policy Implementation
allImplement strict CSP headers to block inline script execution and restrict script sources.
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'";
Plugin Deactivation
allTemporarily disable the plugin until patched.
wp plugin deactivate seriously-simple-podcasting
Or via WordPress admin: Plugins → Installed Plugins → Seriously Simple Podcasting → Deactivate
🧯 If You Can't Patch
- Implement Web Application Firewall with XSS protection rules
- Enable browser XSS filtering headers: X-XSS-Protection: 1; mode=block
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Seriously Simple Podcasting → Version. If version is 3.11.1 or lower, you are vulnerable.Check Version:
wp plugin get seriously-simple-podcasting --field=versionVerify Fix Applied:
Verify plugin version is higher than 3.11.1 and test podcast pages for script injection attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual POST/GET requests to podcast-related endpoints with script tags
- Multiple failed login attempts after visiting podcast pages
Network Indicators:
- Outbound connections to unknown domains from users who visited podcast pages
- Unexpected redirects from podcast URLs
SIEM Query:
source="wordpress.log" AND ("seriously-simple-podcasting" OR "ssp_") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")