CVE-2026-110901 in SmartCrawl Plugin
Summary
by MITRE • 10/16/2026
Authorization Bypass Through User-Controlled Key vulnerability in WPMU DEV SmartCrawl smartcrawl-seo allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects SmartCrawl: from n/a through 3.16.4.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified as an Authorization Bypass Through User-Controlled Key in WPMU DEV SmartCrawl represents a critical failure in access control mechanisms within the WordPress SEO plugin ecosystem. This flaw, specifically affecting versions of SmartCrawl from n/a through 3.16.4, allows attackers to manipulate user-controlled keys or identifiers to bypass intended security restrictions. In web application architecture, authorization checks are designed to ensure that users can only perform actions and access resources for which they have been explicitly granted permission. When this logic relies on a key value provided directly by the client without sufficient server-side validation against authorized roles or permissions, it creates an opportunity for privilege escalation or unauthorized data exposure. The core technical flaw lies in the improper binding of security contexts to user inputs, where the application trusts the integrity of identifiers such as post IDs, configuration keys, or session tokens supplied via HTTP requests rather than verifying them against a secure server-side state database.
From a technical perspective, this vulnerability typically manifests when an API endpoint or administrative function accepts parameters that determine resource ownership but fails to verify that the authenticated user actually owns those resources or holds the necessary privileges to modify them. For instance, if a request includes a parameter like post_id=105 and the application uses this value directly in a database query without checking whether the current session's user ID matches the owner of post 105, an attacker can simply increment or decrement this number to access other users' content. This is often referred to as Insecure Direct Object Reference (IDOR) when applied to specific objects, but in the context of administrative functions or bulk operations within SmartCrawl, it constitutes a broader authorization bypass. The lack of proper checks allows an attacker with even basic authenticated user privileges on WordPress to execute actions reserved for administrators, such as modifying SEO settings, accessing sensitive site configurations, or potentially injecting malicious code through misconfigured fields if input validation is also weak.
The operational impact of this vulnerability is significant due to the widespread adoption of SmartCrawl among WordPress users seeking automated search engine optimization tools. An attacker exploiting this flaw could gain unauthorized administrative access to a website's SEO configuration, leading to potential defacement, malware injection via meta tags or sitemaps, and severe damage to the site's reputation in search engine rankings. Furthermore, if sensitive data is exposed through these bypassed endpoints, it may lead to compliance violations under regulations such as GDPR or CCPA depending on the nature of the leaked information. The ability to alter SEO settings remotely means that attackers can manipulate meta descriptions, titles, and robots.txt directives to redirect traffic to malicious sites or degrade search visibility for legitimate competitors. This undermines the integrity of the web application and compromises the trust users place in their hosting environments and content management systems.
Industry standards classify this type of vulnerability under CWE-284: Improper Access Control, which covers scenarios where access control is not properly enforced on critical functions or data objects. Additionally, it aligns with MITRE ATT&CK technique T1078: Valid Accounts, specifically when combined with privilege escalation tactics that allow lower-privileged users to assume higher roles. To mitigate this risk, developers must implement strict server-side authorization checks for every action involving user-controlled identifiers. This involves verifying the current user's role and permissions against a secure session state before processing any request related to resource modification or deletion. Input validation should also be enforced to ensure that provided keys correspond only to resources explicitly owned by the authenticated user. For administrators using affected versions of SmartCrawl, immediate action is required to update the plugin to version 3.16.5 or later where these access control mechanisms have been corrected. Until an upgrade is possible, implementing Web Application Firewall rules that monitor for anomalous patterns in parameter manipulation can provide a layer of defense against exploitation attempts targeting this specific authorization flaw.