CVE-2026-65049 in Ninja Forms Plugin
Summary
by MITRE • 07/21/2026
Ninja Forms plugin version 3.14.8 and prior for WordPress Multisite contains an incorrect authorization vulnerability that allows a subsite Administrator to trigger network-wide deletion of all Ninja Forms data by exploiting a site-scoped capability check combined with unsafe multisite migration defaults. Attackers can send a crafted POST request to the admin-ajax.php endpoint with the nf_delete_all_data action and a per-site nonce to invoke migration routines that unconditionally iterate all blogs via switch_to_blog(), dropping all nf3_* tables and clearing options and transients across every subsite in the network without requiring super-admin or network-admin privileges.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability resides within the Ninja Forms WordPress plugin ecosystem, specifically affecting versions 3.14.8 and earlier in multisite configurations. The flaw represents a critical authorization bypass that fundamentally undermines the security boundaries between subsites within a WordPress network. The vulnerability manifests through an improper capability verification mechanism that fails to properly validate administrative privileges at the network level when executing destructive operations. Attackers exploiting this weakness can leverage a site-scoped nonce to gain unauthorized access to network-wide administrative functions, effectively circumventing the intended multisite security model where subsite administrators should be restricted from performing actions that affect the entire network infrastructure.
The technical implementation of this vulnerability stems from the plugin's handling of migration routines within a multisite environment. When an attacker sends a crafted POST request to the admin-ajax.php endpoint with the nf_delete_all_data action, the system executes migration code paths that contain unsafe assumptions about privilege levels. The core flaw occurs during the iteration process through all blogs in the network where switch_to_blog() function is called without proper verification of whether the requesting user possesses sufficient privileges for cross-site operations. This pattern directly violates security principle of least privilege and demonstrates a dangerous lack of proper authorization checks at the network level. The vulnerability operates under CWE-285, which addresses improper authorization issues in software systems.
The operational impact of this vulnerability is severe and far-reaching for organizations utilizing WordPress multisite networks with Ninja Forms installations. A malicious subsite administrator can completely destroy all Ninja Forms data across the entire network, including forms, submissions, settings, and configuration options, without requiring elevated privileges typically associated with network-level administrative access. This destructive capability extends beyond simple data loss to encompass complete operational disruption of form-based services that organizations may rely upon for critical business functions such as contact forms, registration systems, or customer feedback mechanisms. The scope of damage multiplies across all subsites within the network, potentially affecting hundreds or thousands of users depending on the size and complexity of the multisite installation.
Mitigation strategies must address both immediate defensive measures and long-term architectural improvements to prevent similar vulnerabilities. Organizations should immediately update to Ninja Forms version 3.14.9 or later where this vulnerability has been patched through proper capability validation at the network level. The patch implements additional authorization checks that verify whether the requesting user possesses appropriate privileges before allowing cross-site operations to proceed. Network administrators should also consider implementing additional monitoring and logging around the admin-ajax.php endpoint to detect suspicious activity patterns, particularly when requests involve deletion or migration actions. Furthermore, organizations should review their multisite configurations to ensure that subsite administrators are not granted unnecessary capabilities that could enable similar attacks. This vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and privilege escalation through improper access control mechanisms, highlighting the need for comprehensive security reviews of all plugin interactions within shared hosting environments and networked systems.