CVE-2024-0893
📋 TL;DR
The Schema App Structured Data plugin for WordPress has a missing capability check that allows authenticated users with subscriber-level access or higher to modify or delete post metadata. This vulnerability affects all versions up to and including 2.1.0, potentially enabling unauthorized content manipulation on WordPress sites using this plugin.
💻 Affected Systems
- Schema App Structured Data for WordPress
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could systematically modify or delete metadata across all posts, disrupting SEO, breaking structured data functionality, or injecting malicious content that affects site visitors.
Likely Case
Subscriber-level users could tamper with post metadata they shouldn't have access to, potentially affecting SEO rankings or breaking structured data displays on specific posts.
If Mitigated
With proper user role management and monitoring, impact would be limited to authorized changes only, maintaining data integrity.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated. The vulnerability is publicly documented with code references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.1
Vendor Advisory: https://plugins.trac.wordpress.org/browser/schema-app-structured-data-for-schemaorg/trunk/lib/SchemaEditor.php#L327
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Schema App Structured Data' and check for updates. 4. Update to version 2.1.1 or higher. 5. Verify the update completed successfully.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate schema-app-structured-data-for-schemaorg
User Role Restriction
linuxTemporarily restrict subscriber-level users from accessing the site
wp user list --role=subscriber --field=ID | xargs wp user set-role {ID} none
🧯 If You Can't Patch
- Remove subscriber-level user accounts or restrict their access
- Implement additional WordPress security plugins to monitor for unauthorized metadata changes
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Schema App Structured Data → Version. If version is 2.1.0 or lower, you are vulnerable.Check Version:
wp plugin get schema-app-structured-data-for-schemaorg --field=versionVerify Fix Applied:
After updating, verify the plugin version shows 2.1.1 or higher in WordPress admin.📡 Detection & Monitoring
Log Indicators:
- Unusual post_meta updates from subscriber-level users
- Multiple metadata modifications in short timeframes from non-admin accounts
Network Indicators:
- POST requests to /wp-admin/admin-ajax.php with action=schema_editor_update from non-admin users
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" AND action="schema_editor_update") AND user_role!="administrator"🔗 References
- https://plugins.trac.wordpress.org/browser/schema-app-structured-data-for-schemaorg/trunk/lib/SchemaEditor.php#L327
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1089ab17-b780-4840-8dcd-c50258513634?source=cve
- https://plugins.trac.wordpress.org/browser/schema-app-structured-data-for-schemaorg/trunk/lib/SchemaEditor.php#L327
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1089ab17-b780-4840-8dcd-c50258513634?source=cve
