CVE-2026-73385 in Plugin Options Plugin
Summary
by MITRE • 08/19/2026
Unauthenticated Broken Access Control in Outranking Plugin Options <= 1.1.3 versions.
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Analysis
by VulDB Data Team • 08/21/2026
The vulnerability identified as an unbroken access control flaw within the Outranking plugin for WordPress, affecting versions up to and including 1.1.3, represents a critical security deficiency that allows unauthorized users to manipulate application settings without valid authentication credentials. This type of issue falls squarely under the category of Broken Access Control, which is consistently ranked among the top ten most severe web application security risks by organizations such as OWASP. In this specific context, the plugin fails to enforce proper authorization checks on administrative endpoints or configuration interfaces that are intended to be restricted to users with elevated privileges, typically administrators. Consequently, any actor who can reach the affected endpoint via a standard HTTP request is able to modify critical plugin configurations, potentially altering site behavior, exposing sensitive data, or introducing malicious code into the system environment.
From a technical perspective, the root cause lies in the absence of server-side validation for user roles and permissions when processing requests related to plugin options. While WordPress typically relies on capability checks such as current_user_can() to restrict access to administrative functions, this implementation appears to have omitted these safeguards or implemented them incorrectly within specific API endpoints or AJAX handlers exposed by the Outranking plugin. This oversight enables an attacker to craft malicious HTTP POST or GET requests that directly interact with the underlying database structures responsible for storing plugin settings. By bypassing the authentication layer entirely, the vulnerability allows for remote configuration changes without any form of user interaction beyond clicking a link or submitting a crafted request, which classifies this as a Remote Code Execution vector if the modified options allow for script injection or file inclusion attacks.
The operational impact of this vulnerability is significant and multifaceted. An attacker can exploit this flaw to deface websites by altering display settings, redirect users to malicious phishing sites through URL manipulation in plugin configurations, or steal sensitive information such as API keys and database credentials stored within the plugin's option table. Furthermore, because many WordPress plugins interact with external services or execute server-side scripts based on their configuration, an attacker could potentially achieve arbitrary code execution by injecting payloads into fields that are later processed by PHP functions like eval() or include(). This transforms a simple access control failure into a severe compromise of system integrity and confidentiality, leading to potential data breaches, loss of customer trust, and significant remediation costs for affected site owners.
In terms of industry classification standards, this vulnerability maps directly to CWE-284: Improper Access Control, which describes situations where an actor is able to access resources or perform actions they are not authorized to do. Additionally, the exploitation technique aligns with MITRE ATT&CK techniques related to Initial Access and Privilege Escalation, specifically leveraging misconfigured permissions to gain foothold in a network environment. The lack of authentication requirement also touches upon CWE-306: Missing Authentication for Critical Function, highlighting the failure to require proof of identity before allowing access to sensitive operations. These mappings provide a standardized framework for security professionals to assess the severity and prioritize remediation efforts based on established risk models rather than ad-hoc assessments.
To mitigate this vulnerability, immediate action is required from both plugin developers and site administrators. The primary mitigation strategy involves upgrading the Outranking plugin to version 1.1.4 or any subsequent release where the access control logic has been corrected to enforce strict role-based permissions on all administrative endpoints. Developers must ensure that every function handling sensitive data performs rigorous checks using WordPress core functions such as current_user_can() with appropriate capabilities like manage_options before processing any input. For administrators unable to upgrade immediately, temporary mitigations include restricting access to the wp-admin directory via IP whitelisting in web server configurations or utilizing security plugins that can block unauthorized AJAX requests and enforce stricter authentication policies on exposed endpoints. Regular auditing of plugin code for proper authorization checks is essential to prevent similar vulnerabilities from being introduced in future updates.