CVE-2026-86779 in Visualizer Plugin
Summary
by MITRE • 09/11/2026
The Visualizer WordPress plugin before 4.0.6 does not properly authorise chart-deletion requests, performing only a site-wide capability check with no per-object ownership verification, allowing users with the Contributor role and above to permanently delete any chart on the site, including charts created by other users such as administrators.
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Analysis
by VulDB Data Team • 09/11/2026
The vulnerability identified in Visualizer WordPress plugin versions prior to 4.0.6 represents a critical failure in access control mechanisms, specifically categorized under CWE-285 Improper Authorization. This flaw stems from an insufficient verification process during the execution of chart deletion operations. The application logic relies exclusively on a broad site-wide capability check rather than implementing granular per-object ownership validation. In typical WordPress architectures, while role-based permissions determine whether a user can access certain administrative functions, they do not inherently grant authority to modify or destroy resources owned by other users unless explicitly designed to allow such cross-user actions. By omitting the verification of chart ownership, the plugin fails to enforce the principle of least privilege at the resource level, allowing any authenticated user with elevated privileges to bypass intended restrictions on data manipulation.
From a technical perspective, this deficiency allows attackers possessing the Contributor role or higher permissions to issue requests that result in the permanent deletion of charts created by other users, including those belonging to administrators and super-admins. This lack of object-level authorization control means that the integrity of user-generated content is compromised without requiring privilege escalation beyond what is already granted for basic administrative tasks. The operational impact extends beyond simple data loss; it undermines trust within collaborative environments where multiple authors contribute visualizations. Administrators may find their work erased by lower-privileged users, leading to potential business disruption and reputational damage if critical analytics or reports are destroyed maliciously.
This vulnerability aligns with the MITRE ATT&CK framework technique T1485 Destruction of Data, as it enables an attacker to render data unusable through deletion. Furthermore, it reflects common patterns found in CWE-639 Authorization Bypass Through User-Controlled Key if the request parameters were manipulated, though here the primary issue is the absence of ownership checks regardless of parameter manipulation. The flaw highlights a broader trend in web application development where developers assume that checking for general administrative capabilities is sufficient to secure all actions within an admin interface, neglecting the necessity of verifying resource ownership for state-changing operations like deletion or modification.
To mitigate this vulnerability, immediate action should be taken by updating the Visualizer plugin to version 4.0.6 or later, where these authorization checks have been corrected. For organizations unable to update immediately due to compatibility constraints, temporary mitigation strategies include restricting access to the affected functionality through web application firewalls that can monitor and block unauthorized deletion requests based on user roles and resource ownership metadata if available in logs. Additionally, implementing strict backup procedures ensures that data recovery is possible should an incident occur. Developers must ensure future implementations adhere to robust authorization models that verify both role-based permissions and object-specific ownership before executing destructive actions, thereby preventing similar bypasses in other plugins or custom code within the WordPress ecosystem.