CVE-2026-107309 in Easy Breadcrumb
Summary
by MITRE • 10/30/2026
Missing Authorization vulnerability in Drupal Easy Breadcrumb allows Forceful Browsing. This issue affects Easy Breadcrumb versions: from 0.0.0 to 2.0.11.
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Analysis
by VulDB Data Team • 10/30/2026
The identified security flaw within the Drupal module known as Easy Breadcrumb represents a critical failure in access control mechanisms, specifically categorized under CWE-862 Missing Authorization and aligned with MITRE ATT&CK technique T1078 Valid Accounts for lateral movement or privilege escalation depending on context. This vulnerability exists in versions ranging from 0.0.0 through 2.0.11, indicating a long-standing oversight in the module's security architecture that has persisted across multiple major releases. The core technical issue stems from an insufficient validation of user permissions when handling requests related to breadcrumb configuration and display logic. In a properly secured application state, any operation or data retrieval request must be rigorously checked against the requesting entity's assigned roles and privileges before execution. However, in this specific implementation, the module fails to enforce these checks on certain administrative endpoints or internal API calls that are exposed through its public-facing interface.
This architectural deficiency allows for forceful browsing attacks where an authenticated attacker with lower-level permissions can interact with functionality intended exclusively for administrators or users with higher privilege levels. By manipulating HTTP requests directly rather than using the standard user interface, a malicious actor can bypass the expected role-based access controls. This capability enables unauthorized entities to view sensitive configuration data, modify breadcrumb structures without proper oversight, or potentially exploit related functionalities that rely on these configurations to alter site navigation in unintended ways. The impact extends beyond simple information disclosure; it compromises the integrity of the website's structure and may serve as a stepping stone for further exploitation if other vulnerabilities are present within the broader Drupal ecosystem.
The operational impact of this vulnerability is significant, particularly for sites relying heavily on dynamic breadcrumb generation for user experience and SEO purposes. Attackers can exploit this flaw to gain insights into site architecture that should remain hidden from lower-privileged users, such as internal page hierarchies or administrative paths. Furthermore, if the module interacts with other system components without proper isolation, an attacker could potentially trigger side effects by manipulating breadcrumb data, leading to denial of service conditions or cross-site scripting vectors if input sanitization is also compromised in related functions. The persistence of this issue across such a wide version range suggests that previous security audits may have overlooked these specific entry points within the module's codebase.
To mitigate this risk, site administrators must immediately upgrade Easy Breadcrumb to version 2.0.12 or any subsequent release where the authorization checks have been properly implemented and tested. Until an update is applied, it is advisable to restrict access to administrative pages using web application firewalls that can detect anomalous request patterns indicative of forceful browsing attempts. Additionally, implementing strict role-based access control policies at the infrastructure level can help limit the blast radius should an attacker successfully exploit this flaw. Regular security audits and code reviews focusing on authorization logic are essential to prevent similar oversights in future module updates or custom integrations within the Drupal environment.