CVE-2025-0863
📋 TL;DR
This vulnerability allows authenticated WordPress users with contributor-level access or higher to inject malicious scripts into web pages using the Flexmls IDX Plugin's 'idx_frame' shortcode. The scripts execute whenever users view the compromised pages, enabling attackers to steal session cookies, redirect users, or deface websites. All WordPress sites using Flexmls IDX Plugin versions up to 3.14.27 are affected.
💻 Affected Systems
- Flexmls IDX Plugin for WordPress
⚠️ 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 session cookies, take over WordPress sites, install backdoors, redirect users to malicious sites, or deploy ransomware notices.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, redirect visitors to phishing pages, or display unwanted advertisements.
If Mitigated
With proper user access controls and content security policies, impact is limited to defacement or temporary disruption of affected pages.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple - attackers just need to add malicious attributes to the idx_frame shortcode.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 3.14.27
Vendor Advisory: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3251292%40flexmls-idx&new=3251292%40flexmls-idx&sfp_email=&sfph_mail=
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Flexmls IDX Plugin' and click 'Update Now'. 4. Verify the plugin version is 3.14.28 or higher.
🔧 Temporary Workarounds
Disable idx_frame shortcode
allRemove or disable the vulnerable shortcode functionality
Add to theme's functions.php: remove_shortcode('idx_frame');
Restrict user roles
allLimit contributor-level access to trusted users only
Use WordPress role management plugins to restrict contributor capabilities
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Regularly audit user accounts and remove unnecessary contributor-level access
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → Flexmls IDX Plugin version. If version is 3.14.27 or lower, you are vulnerable.Check Version:
wp plugin list --name=flexmls-idx --field=versionVerify Fix Applied:
After updating, verify the plugin version shows 3.14.28 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to post editing pages with idx_frame parameters
- Multiple page edits by contributor-level users in short timeframes
Network Indicators:
- Unexpected JavaScript loading from WordPress pages
- External script calls from idx_frame content
SIEM Query:
source="wordpress.log" AND ("idx_frame" OR "edit-post") AND user_role="contributor"🔗 References
- https://plugins.trac.wordpress.org/browser/flexmls-idx/tags/3.14.25/flexmls_connect.php#L92
- https://plugins.trac.wordpress.org/browser/flexmls-idx/tags/3.14.25/lib/base.php#L220
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3251292%40flexmls-idx&new=3251292%40flexmls-idx&sfp_email=&sfph_mail=
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1c8e814b-3828-4b3f-a9ad-b3758ab9b109?source=cve
