CVE-2026-81788 in IMPress for IDX Broker Plugin
Summary
by MITRE • 09/10/2026
Subscriber Broken Access Control in IMPress for IDX Broker <= 3.3.0 versions.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified as Subscriber Broken Access Control within the IMPress plugin for IDX Broker, affecting versions up to and including 3.3.0, represents a critical flaw in how user roles and permissions are enforced on the server side. This specific weakness allows authenticated users with lower privilege levels, such as subscribers or contributors, to perform administrative actions that should be restricted exclusively to administrators. The core of this issue lies in insufficient authorization checks during the processing of HTTP requests related to IDX Broker configurations. In a properly secured application, every action triggered by a user must verify not only their authentication status but also their authorization level against the specific resource or function they are attempting to access. However, in these vulnerable versions of IMPress, the backend logic fails to validate whether the current user possesses the necessary capabilities before executing sensitive operations. This oversight creates a direct pathway for privilege escalation, where an attacker can manipulate request parameters to invoke administrative endpoints that were intended to be inaccessible.
From a technical perspective, this flaw aligns with CWE-269, which classifies Improper Privilege Control. The vulnerability typically manifests when the application relies on client-side controls or assumes that non-administrative users will not attempt to access restricted features. In reality, attackers can bypass these superficial checks by crafting custom HTTP requests using tools like curl or Burp Suite. By modifying parameters such as action identifiers, nonce values if they are improperly validated, or specific configuration keys within the IDX Broker settings, a low-privileged user can trigger functions that modify site-wide settings, alter search result displays, or change integration credentials. The absence of robust server-side validation means that the application processes these requests as valid administrative commands, effectively granting the attacker elevated privileges without any additional authentication steps. This type of broken access control is particularly dangerous because it undermines the fundamental security model of multi-user WordPress environments where role-based access control is essential for maintaining data integrity and operational stability.
The operational impact of this vulnerability extends beyond simple privilege escalation to include potential data tampering, service disruption, and further compromise of the hosting environment. An attacker exploiting this flaw could modify IDX Broker settings to redirect search results to malicious domains, thereby facilitating phishing attacks against site visitors who rely on property listings for information. Additionally, the ability to alter administrative configurations may allow an attacker to inject persistent backdoors or manipulate database entries that store sensitive client data associated with real estate transactions. This not only compromises the confidentiality and integrity of user data but also damages the reputation of the website owner and potentially violates regulatory compliance requirements such as GDPR or CCPA if personal information is exposed or mishandled due to unauthorized configuration changes. The ease of exploitation means that automated scanners can quickly identify vulnerable instances, leading to widespread compromise across sites running outdated versions of the plugin without immediate patching measures in place.
To mitigate this risk, it is imperative for administrators to upgrade IMPress for IDX Broker to a version newer than 3.3.0 immediately upon release by the vendor. The updated releases include patches that enforce strict server-side authorization checks on all administrative endpoints and actions. Until an update can be applied, temporary mitigation strategies should involve restricting access to the WordPress admin area through IP whitelisting or two-factor authentication for all user accounts with elevated privileges. Furthermore, implementing a Web Application Firewall (WAF) can help detect and block anomalous requests that attempt to invoke administrative functions from non-administrative sessions. Regular security audits and penetration testing are recommended to identify similar access control weaknesses in other plugins or custom code within the WordPress ecosystem. Adhering to industry standards such as OWASP Top 10, specifically Category A05:2021 Broken Access Control, ensures that developers and administrators prioritize robust permission validation mechanisms. By maintaining up-to-date software and enforcing strict role-based access controls, organizations can significantly reduce their attack surface and protect against unauthorized privilege escalation attacks targeting WordPress plugins.