CVE-2026-93366 in Bludit
Summary
by MITRE • 09/25/2026
Bludit CMS through 3.22.0 contains an authorization bypass vulnerability that allows authenticated users with the Author role to enumerate and delete media files belonging to pages owned by other users, including administrators, by supplying arbitrary uuid parameters to unprotected AJAX endpoints. Attackers can retrieve page UUIDs for all users via the content-get-list endpoint and then submit crafted POST requests to the list-images and delete-image endpoints in bl-kernel/ajax/ to access and destroy media files outside their own pages, bypassing the IMAGE_RESTRICT isolation control.
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Analysis
by VulDB Data Team • 09/25/2026
The vulnerability identified in Bludit CMS versions through 3.22.0 represents a critical authorization bypass flaw that undermines the fundamental security model of role-based access controls within the application. This issue specifically affects users assigned the Author role, who are typically expected to have restricted permissions compared to administrators or editors. The core technical deficiency lies in the improper implementation of isolation checks for AJAX endpoints responsible for managing media assets. While Bludit implements an IMAGE_RESTRICT configuration intended to limit user visibility and modification rights strictly to their own content, this control is effectively bypassed due to insufficient validation on server-side request handlers.
The exploitation mechanism relies on the manipulation of unique identifier parameters within HTTP POST requests directed at specific AJAX endpoints located in the bl-kernel/ajax/ directory. Specifically, the list-images and delete-image endpoints fail to verify that the media files being accessed or removed belong exclusively to the authenticated user making the request. Instead, these endpoints accept arbitrary uuid values provided by the attacker without cross-referencing them against the ownership records associated with the current session's identity. This lack of object-level authorization allows an adversary to specify identifiers belonging to pages owned by other users, including those with higher privilege levels such as administrators.
The process begins with reconnaissance, where the attacker utilizes the content-get-list endpoint to enumerate page UUIDs across all user accounts within the system. Because this listing function does not adequately restrict visibility based on user roles or ownership, it serves as a reliable source of target identifiers for subsequent exploitation steps. Once valid uuid values are obtained, the attacker constructs malicious POST requests targeting the list-images and delete-image endpoints. By injecting these arbitrary identifiers into the request payload, the application processes them without enforcing the expected boundary constraints, thereby exposing private media files or permanently deleting them regardless of ownership status.
The operational impact of this vulnerability is severe, encompassing both confidentiality and integrity compromises within the CMS environment. Attackers can exfiltrate sensitive images, documents, or other binary assets stored in directories that were intended to be inaccessible to lower-privileged users. Furthermore, the ability to delete media files belonging to administrators or other authors disrupts content availability and can lead to data loss if critical resources are destroyed intentionally or accidentally during exploitation attempts. This erosion of trust between user roles weakens the overall security posture of multi-user installations where distinct separation of duties is required for proper workflow management.
From a classification perspective, this vulnerability aligns with CWE-284 Improper Access Control and CWE-639 Authorization Bypass Through User-Controlled Key. The failure to enforce ownership checks on resource manipulation operations constitutes a classic example of insecure direct object references where the application relies solely on client-supplied identifiers rather than server-side validation against authorized access lists. In terms of tactical mapping, this behavior corresponds to ATT&CK technique T1083 File and Directory Discovery for enumeration and potentially T1485 Data Destruction if deletion is executed with malicious intent.
Mitigation strategies must prioritize immediate patching to the latest stable version of Bludit CMS where these authorization checks have been corrected at the framework level. Administrators should ensure that all AJAX endpoints performing resource operations implement strict server-side validation confirming that the requested object belongs to the authenticated user or an entity they are explicitly permitted to manage. Additionally, implementing principle of least privilege by restricting access to administrative functions and auditing endpoint configurations can reduce the attack surface. Regular security assessments focusing on role-based permission enforcement will help identify similar gaps in other modules before they can be exploited in production environments.