CVE-2026-108066 in WP 2FA Plugin
Summary
by MITRE • 10/14/2026
The WP 2FA WordPress plugin before 4.2.0 does not perform an object-level capability check before removing a user's two-factor authentication configuration, allowing a site administrator on WordPress Multisite to remove the 2FA configuration of users outside their own site, including accounts they are not permitted to edit. On single-site installs an administrator can already manage all users, so this crosses a trust boundary only on Multisite.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified in WP 2FA versions prior to 4.2.0 represents a critical authorization flaw within the plugin's user management functionality, specifically affecting WordPress Multisite environments. The core technical deficiency lies in the absence of an object-level capability check when executing operations that remove two-factor authentication configurations for users. In secure software design, any action that modifies or deletes sensitive security settings associated with a specific entity must verify not only the general role permissions of the actor but also their specific authorization relative to that target entity. The plugin fails to enforce this granular control, relying instead on broader administrative privileges without validating whether the administrator has explicit permission to manage the targeted user account within the multisite network structure.
This architectural oversight allows a site administrator in a WordPress Multisite installation to bypass intended trust boundaries and remove the two-factor authentication configuration of users who reside outside their specific subsite or whom they are not permitted to edit. While administrators on single-site installations inherently possess global authority over all user accounts, making this behavior consistent with expected privilege levels, the multisite architecture is designed to isolate administrative control per site. By allowing cross-site modification of security configurations without proper validation, the vulnerability effectively collapses these isolation boundaries, granting elevated privileges that extend beyond the scope defined by the network's permission model.
The operational impact of this flaw is significant from a cybersecurity and compliance perspective. Two-factor authentication serves as a primary defense mechanism against credential theft and unauthorized access. By enabling an administrator to strip away this security layer for other users without authorization, the vulnerability potentially exposes those accounts to brute-force attacks or password spraying campaigns that would otherwise be mitigated by the second factor. This undermines the principle of least privilege and can lead to account takeovers if the targeted user's primary credentials are compromised. Furthermore, it violates organizational policies regarding access control and audit trails, as actions taken against users outside one’s jurisdiction occur without proper authorization logging or oversight mechanisms being triggered for that specific cross-site action.
From a classification standpoint, this vulnerability aligns with CWE-269, which describes Improper Privilege Check, specifically where the system fails to verify sufficient privileges before performing an operation on a specific object. It also relates to CWE-862, Missing Authorization, as the application does not enforce access control policies for the resource being modified. In terms of offensive security frameworks such as MITRE ATT&CK, this flaw facilitates lateral movement and privilege escalation within the WordPress ecosystem by allowing attackers who compromise an administrator account on one site in a multisite network to weaken the security posture of accounts on other sites, thereby expanding their potential attack surface across the entire network infrastructure.
To mitigate this vulnerability, organizations running affected versions must immediately upgrade WP 2FA to version 4.2.0 or later, where object-level capability checks have been implemented to ensure that only users with explicit permission for a specific account can modify its authentication settings. For environments unable to update immediately due to compatibility constraints, temporary mitigations should include restricting the number of administrators within multisite installations and enforcing strict network-wide policies regarding user management permissions. Additionally, implementing web application firewalls or custom code patches that intercept and validate object-level capabilities before allowing deletion requests can provide a layer of defense until the software is updated. Regular auditing of administrative actions in WordPress logs is also recommended to detect any unauthorized attempts to modify security configurations across site boundaries.