CVE-2025-13963
📋 TL;DR
The FX Currency Converter WordPress plugin has a stored XSS vulnerability in its 'fxcc_convert' shortcode that allows authenticated attackers with contributor-level access or higher to inject malicious scripts. These scripts execute whenever users view pages containing the compromised shortcode, potentially compromising visitor sessions and site integrity. All WordPress sites using this plugin up to version 0.2.0 are affected.
💻 Affected Systems
- FX Currency Converter 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, deface websites, redirect users to malicious sites, or install backdoors for persistent access.
Likely Case
Attackers with contributor access inject malicious scripts that steal user session cookies or display unwanted content to visitors.
If Mitigated
With proper user role management and content review, impact is limited to minor content manipulation by trusted users.
🎯 Exploit Status
Exploitation requires authenticated access with contributor privileges or higher. The vulnerability is in a shortcode handler, making injection straightforward for attackers with content creation permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.1 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'FX Currency Converter' and check if update is available. 4. Click 'Update Now' to install version 0.2.1 or later. 5. Verify the plugin is active and functioning correctly.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate fx-currency-converter
Restrict User Roles
allRemove contributor-level access from untrusted users
wp user list --role=contributor --field=ID
wp user set-role <user_id> subscriber
🧯 If You Can't Patch
- Remove contributor and author roles from all untrusted users
- Review and audit all posts/pages containing the fxcc_convert shortcode for malicious content
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for FX Currency Converter version 0.2.0 or earlierCheck Version:
wp plugin get fx-currency-converter --field=versionVerify Fix Applied:
Verify plugin version is 0.2.1 or later in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual shortcode modifications in post/page edits
- Multiple failed login attempts followed by successful contributor login
Network Indicators:
- Unexpected JavaScript loading from WordPress pages
- Suspicious outbound connections after page views
SIEM Query:
source="wordpress" AND (event="post_updated" OR event="page_updated") AND user_role="contributor" AND content CONTAINS "fxcc_convert"🔗 References
- https://plugins.trac.wordpress.org/browser/fx-currency-converter/tags/0.2.0/includes/shortcode.php#L57
- https://plugins.trac.wordpress.org/browser/fx-currency-converter/trunk/includes/shortcode.php#L57
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3415819%40fx-currency-converter&new=3415819%40fx-currency-converter&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d01a7887-afd7-418b-99ad-92157582a506?source=cve
