CVE-2026-12081 Overview
CVE-2026-12081 is a PHP object injection vulnerability in the Database for Contact Form 7, WPforms, Elementor forms WordPress plugin before version 1.5.2. The plugin fails to restrict PHP classes allowed during deserialization of attacker-supplied form-field values. Unauthenticated users can submit crafted form data containing serialized PHP objects. When an administrator later views the stored entry, the objects are instantiated in the WordPress context.
The issue is an incomplete fix of CVE-2025-7384 and CVE-2026-2599. Prior patches hardened other deserialization paths but missed the entry-editor file-field path.
Critical Impact
Unauthenticated attackers can inject arbitrary PHP objects that execute when an admin views a form submission, enabling property-oriented gadget chains against installed plugins and themes.
Affected Products
- Database for Contact Form 7, WPforms, Elementor forms WordPress plugin versions prior to 1.5.2
- WordPress sites accepting form submissions through the affected plugin
- Administrator sessions that render stored form entries in the entry editor
Discovery Timeline
- 2026-07-13 - CVE-2026-12081 published to the National Vulnerability Database
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-12081
Vulnerability Analysis
The vulnerability is an insecure deserialization flaw [CWE-502] leading to PHP Object Injection. The plugin stores form-field values submitted by anonymous visitors, including file-field metadata. When an administrator opens the entry editor to review a submission, the file-field value is passed through unserialize() without a class allowlist.
An attacker who supplies a serialized PHP object triggers instantiation of arbitrary classes reachable in the WordPress runtime. Exploitation depends on the availability of magic methods such as __wakeup, __destruct, or __toString in loaded plugins, themes, or the WordPress core. These serve as property-oriented programming (POP) gadgets and can lead to file writes, SQL execution, or remote code execution depending on the gadget chain.
Exploitation requires administrator interaction (viewing the entry), which lowers reliability but does not require authentication of the attacker.
Root Cause
The root cause is a call to PHP's unserialize() on untrusted form-field content without the allowed_classes option set to false or a strict allowlist. Earlier patches for CVE-2025-7384 and CVE-2026-2599 added restrictions to other deserialization sites but did not cover the entry-editor file-field code path.
Attack Vector
The attack is delivered over the network through any public form powered by the plugin. The attacker submits a form where a file-field value contains a crafted PHP serialized payload. The payload sits dormant in the database until an administrator opens the corresponding entry in the WordPress admin interface. Deserialization then instantiates the attacker-controlled object graph within the administrator's authenticated context.
Technical details are documented in the WPScan Vulnerability Report.
Detection Methods for CVE-2026-12081
Indicators of Compromise
- Form-entry rows in the plugin's database tables containing values beginning with PHP serialization markers such as O:, a:, or C: in file-field columns
- Unexpected PHP errors or warnings referencing __wakeup, __destruct, or class instantiation when administrators open the plugin's entry editor
- New or modified PHP files in wp-content/ created shortly after an admin viewed a form entry
- Outbound network requests originating from the web server immediately following entry-editor page loads
Detection Strategies
- Inspect stored plugin entries for serialized PHP patterns in fields that should contain plain filenames or paths
- Review WordPress and PHP error logs for deserialization warnings correlated with admin sessions
- Monitor file integrity of the WordPress installation, focusing on wp-content/plugins/ and wp-content/uploads/
Monitoring Recommendations
- Enable web application firewall (WAF) rules that flag serialized PHP payloads in POST bodies to form endpoints
- Alert on administrator page loads that trigger PHP fatal errors or unusual process launches by the web server user
- Correlate form submission source IPs with subsequent admin activity to identify targeted staging of malicious entries
How to Mitigate CVE-2026-12081
Immediate Actions Required
- Update the Database for Contact Form 7, WPforms, Elementor forms plugin to version 1.5.2 or later on all WordPress sites
- Audit existing form entries for serialized PHP payloads and purge any suspicious records before administrators open them
- Rotate WordPress administrator credentials and session tokens if unexplained admin activity is observed
Patch Information
Upgrade to version 1.5.2 or later, which restricts the classes permitted during deserialization on the entry-editor file-field path. Refer to the WPScan Vulnerability Report for advisory details.
Workarounds
- Temporarily disable the plugin until the update is applied if patching cannot be performed immediately
- Restrict access to /wp-admin/ and the plugin's entry-editor pages by IP allowlist to prevent inadvertent viewing of malicious entries
- Delete unreviewed form submissions received before the upgrade rather than opening them in the entry editor
- Deploy WAF signatures that block request bodies containing PHP serialization tokens in file-field parameters
# Configuration example: identify suspicious serialized payloads in form entries
wp db query "SELECT id, form_id, field_value FROM wp_cf7_entries \
WHERE field_value REGEXP '^(O|a|C|s):[0-9]+:';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
