CVE-2025-4595
📋 TL;DR
The FastSpring WordPress plugin has a stored XSS vulnerability in its product catalog block that allows authenticated attackers with contributor-level access or higher to inject malicious scripts. These scripts execute when users view compromised pages, potentially stealing credentials or performing unauthorized actions. All WordPress sites using FastSpring plugin versions up to 3.0.1 are affected.
💻 Affected Systems
- FastSpring WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, install backdoors, redirect users to malicious sites, or deface the website completely.
Likely Case
Attackers with contributor access inject malicious scripts to steal user session cookies or credentials, potentially gaining administrative access.
If Mitigated
With proper user role management and content review processes, impact is limited to potential defacement of specific pages.
🎯 Exploit Status
Exploitation requires authenticated access with contributor privileges or higher. The vulnerability is in a specific block attribute, making targeted exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.2 or later
Vendor Advisory: https://wordpress.org/plugins/fastspring/
Restart Required: No
Instructions:
1. Log into WordPress admin panel
2. Navigate to Plugins → Installed Plugins
3. Find FastSpring plugin
4. Click 'Update Now' if update available
5. If no update available, download version 3.0.2+ from WordPress.org
6. Deactivate old plugin, upload new version, activate
🔧 Temporary Workarounds
Disable FastSpring Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate fastspring
Restrict Contributor Access
allRemove contributor-level users or restrict their permissions
🧯 If You Can't Patch
- Implement strict user role management - remove unnecessary contributor accounts
- Add Content Security Policy headers to restrict script execution sources
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → FastSpring version. If version is 3.0.1 or lower, you are vulnerable.Check Version:
wp plugin get fastspring --field=versionVerify Fix Applied:
Verify FastSpring plugin version is 3.0.2 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to wp-admin/post.php with color parameter containing script tags
- Multiple page edits by contributor users in short time
Network Indicators:
- Outbound connections to suspicious domains from WordPress pages
- Script tags in page content that reference external domains
SIEM Query:
source="wordpress.log" AND ("color=" AND ("<script" OR "javascript:"))