Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
Sources: National Vulnerability Database, CISA KEV, Exploit-DB
CVE-2026-110378 Overview
CVE-2026-110378 is a Missing Authorization vulnerability [CWE-862] in the WP E-Signature Ninja Forms Signature Contract Add-On for WordPress. The flaw stems from incorrectly configured access control security levels in the ninja-signature-contract-forms-add-on plugin. It affects all versions up to and including 3.2.5. An unauthenticated attacker can send network requests to plugin endpoints that fail to enforce proper authorization checks. Successful exploitation discloses information that should remain restricted to authorized users. The issue was published to the National Vulnerability Database on October 15, 2026.
Critical Impact
Unauthenticated remote attackers can abuse broken access control in the plugin to access restricted functionality or data on affected WordPress sites.
Affected Products
- WP E-Signature Ninja Forms Signature Contract Add-On
- Plugin slug: ninja-signature-contract-forms-add-on
- Versions through 3.2.5
Discovery Timeline
- 2026-10-15 - CVE-2026-110378 published to NVD
- 2026-10-15 - Last updated in NVD database
Technical Details for CVE-2026-110378
Vulnerability Analysis
The Ninja Forms Signature Contract Add-On exposes functionality through WordPress action handlers and endpoints that lack proper capability or nonce verification. An attacker can invoke these handlers over the network without authentication. The vulnerability maps to CWE-862 (Missing Authorization), where the application does not verify that the requester is permitted to perform the requested action. The impact is scoped to confidentiality, with no direct effect on integrity or availability of the host system. Signature contract plugins typically process signer identity details, document metadata, and signature records, making unauthorized access a privacy and compliance concern.
Root Cause
The plugin registers handlers that perform sensitive operations without calling current_user_can() or validating a nonce via check_ajax_referer(). Access decisions rely on client-supplied input instead of server-side authorization. This allows requests from users who should have no access to the signature contract workflow to reach protected logic.
Attack Vector
Exploitation requires only network access to the target WordPress site. No authentication or user interaction is required. An attacker crafts HTTP requests to the vulnerable plugin endpoints, bypassing the intended access control checks. See the Patchstack Vulnerability Report for additional technical context.
// No verified public exploit code is available at the time of publication.
// The vulnerability is triggered by unauthenticated HTTP requests to plugin
// handlers that fail to enforce authorization. Refer to vendor advisories
// for a complete technical description.
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Stop Identity AttacksDetection Methods for CVE-2026-110378
Indicators of Compromise
- Unauthenticated HTTP POST or GET requests to WordPress admin-ajax.php referencing plugin actions associated with ninja-signature-contract-forms-add-on.
- Requests to plugin REST routes originating from IP addresses with no established session or login history.
- Unexpected read access to signature contract data or export files on the affected site.
Detection Strategies
- Review WordPress access logs for anonymous requests targeting plugin action parameters tied to the signature contract add-on.
- Correlate web server logs with authentication logs to identify handler access without a corresponding logged-in session.
- Deploy a WordPress-aware web application firewall rule that enforces authentication on plugin endpoints pending patch deployment.
Monitoring Recommendations
- Monitor for anomalous volume of requests to admin-ajax.php with the plugin's action values.
- Alert on outbound data transfers originating from the WordPress host that correlate with signature or form submission records.
- Track plugin version inventory across managed WordPress instances to flag hosts still running versions through 3.2.5.
How to Mitigate CVE-2026-110378
Immediate Actions Required
- Identify all WordPress sites running the Ninja Forms Signature Contract Add-On and inventory plugin versions.
- Restrict access to wp-admin and admin-ajax.php using IP allowlists or authentication gateways where feasible.
- Deploy WAF rules that block anonymous requests to the plugin's action handlers until a patched version is confirmed.
Patch Information
At the time of publication, the advisory lists affected versions through 3.2.5 with no fixed version explicitly documented in the NVD record. Monitor the Patchstack Vulnerability Report and the vendor's plugin page for an updated release addressing the missing authorization checks.
Workarounds
- Disable and remove the Ninja Forms Signature Contract Add-On until a patched version is released.
- Restrict access to WordPress admin endpoints via HTTP authentication or firewall rules at the reverse proxy layer.
- Place the site behind a managed WAF with virtual patching for WordPress plugin broken access control issues.
# Example: temporarily deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate ninja-signature-contract-forms-add-on
wp plugin status ninja-signature-contract-forms-add-on
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
Sources: National Vulnerability Database, CISA KEV, Exploit-DB
