CVE-2026-114743 in InstaWP Connect Plugin
Summary
by MITRE • 10/25/2026
The InstaWP Connect WordPress plugin before 0.1.4.2 does not perform a capability check on its InstaWP Connect WordPress plugin before 0.1.4.2-settings update action, verifying only a nonce, allowing an authenticated user holding a low-privileged role that an administrator has granted access to the InstaWP Connect WordPress plugin before 0.1.4.2's sync feature to overwrite the InstaWP Connect WordPress plugin before 0.1.4.2's settings, including the setting controlling which roles may access that feature. The role grant is not enabled by default.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/25/2026
The vulnerability identified in InstaWP Connect versions prior to 0.1.4.2 represents a critical authorization flaw rooted in insufficient verification of user privileges during administrative configuration updates. Specifically, the plugin fails to enforce proper capability checks when processing requests to update its settings via the designated WordPress action endpoint. Instead of validating that the requesting user possesses the necessary administrator-level permissions required for modifying core plugin configurations, the system relies exclusively on nonce validation. While nonces provide protection against Cross-Site Request Forgery attacks by ensuring the request originated from a legitimate source within the current session, they do not inherently verify the identity or privilege level of the authenticated user making the request. This architectural oversight creates a scenario where any authenticated user who can successfully generate a valid nonce for this specific action may manipulate sensitive plugin settings.
The operational impact of this flaw is significant because it allows low-privileged users to escalate their effective privileges within the context of the InstaWP Connect application. Although WordPress typically restricts administrative functions to users with high-level roles such as Administrator, this vulnerability bypasses those restrictions by exploiting the lack of capability verification on a specific settings update endpoint. An attacker who has been granted access to the sync feature of the plugin can overwrite critical configuration parameters. Most notably, they can modify the setting that dictates which user roles are permitted to access the synchronization functionality. By altering these role-based access controls, an attacker with minimal initial privileges can effectively grant themselves or other low-privileged accounts broader administrative capabilities than intended by the site administrator.
This type of vulnerability is classically categorized under CWE-269, Improper Privilege Management, as it involves a failure to enforce proper authorization checks for elevated actions. Furthermore, from an offensive security perspective aligned with the MITRE ATT&CK framework, this flaw facilitates privilege escalation and can be leveraged in conjunction with other techniques such as valid credential abuse or session hijacking if combined with additional vectors like Cross-Site Scripting that might aid in nonce theft. The exploitation path typically involves crafting a malicious request to the settings update endpoint containing a forged but technically valid nonce obtained through legitimate interaction or, in cases where nonces are predictable or leaked via other vulnerabilities, directly manipulating the state of the application.
It is important to note that this vulnerability does not affect all installations by default because the role grant mechanism required for exploitation is not enabled out-of-the-box. The attacker must first have been explicitly granted access to the sync feature by an administrator who already has sufficient privileges to make such grants. However, in environments where administrators frequently delegate specific plugin functionalities to lower-tier users or contributors without fully understanding the security implications of those permissions, this flaw becomes a viable attack vector for privilege escalation within the WordPress ecosystem.
To mitigate this risk, immediate action is required by upgrading the InstaWP Connect plugin to version 0.1.4.2 or later, where the capability check has been properly implemented alongside nonce validation. Site administrators should also review user roles and capabilities assigned to any users interacting with third-party plugins, adhering to the principle of least privilege. Ensuring that only trusted administrators can modify core security settings prevents unauthorized changes to access control lists. Regular auditing of plugin configurations and keeping all WordPress components updated are essential practices for maintaining a secure environment against such authorization bypass vulnerabilities.