CVE-2025-26900
📋 TL;DR
This vulnerability allows attackers to inject malicious objects through deserialization of untrusted data in the Flexmls® IDX WordPress plugin. Successful exploitation could lead to remote code execution or data manipulation. All WordPress sites using Flexmls® IDX versions up to 3.14.27 are affected.
💻 Affected Systems
- Flexmls® IDX 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
Complete system compromise allowing remote code execution, data theft, and website defacement.
Likely Case
Unauthorized data access, plugin functionality disruption, and potential privilege escalation.
If Mitigated
Limited impact with proper input validation and security controls in place.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.14.28 or later
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find Flexmls® IDX. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patching is possible.
wp plugin deactivate flexmls-idx
Input Validation Filter
allImplement WAF rules to block suspicious deserialization patterns.
🧯 If You Can't Patch
- Isolate affected WordPress instance from critical network segments
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Flexmls® IDX version number.Check Version:
wp plugin get flexmls-idx --field=versionVerify Fix Applied:
Confirm plugin version is 3.14.28 or higher and test plugin functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual PHP object deserialization errors in WordPress logs
- Unexpected plugin file modifications
Network Indicators:
- HTTP requests containing serialized PHP objects to plugin endpoints
SIEM Query:
source="wordpress.log" AND "flexmls" AND ("unserialize" OR "object injection")