CVE-2026-88910 in kboard Plugin
Summary
by MITRE • 09/16/2026
The kboard WordPress plugin before 6.7 does not verify ownership or context before deleting board media, allowing unauthenticated attackers to permanently delete its uploaded media files and their database records by iterating identifiers.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in the kboard WordPress plugin prior to version 6.7 represents a critical failure in access control mechanisms, specifically categorized under CWE-284 Improper Access Control. This flaw stems from an insufficient verification of user ownership and contextual integrity when processing requests intended for media deletion operations. In secure software design, any action that modifies or destroys persistent data must strictly validate that the requesting entity possesses both administrative privileges over the specific resource and a valid session context authorizing such destructive actions. The kboard plugin fails to implement these necessary checks, thereby exposing board-specific uploaded files and their associated database records to unauthorized manipulation by external actors.
From an operational perspective, this vulnerability allows unauthenticated attackers to execute arbitrary file deletion attacks without requiring any form of authentication or login credentials. By iterating through predictable identifiers such as post IDs, attachment IDs, or other sequential numeric values present in the plugin's API endpoints, an attacker can systematically target and remove media assets associated with various boards on a compromised WordPress installation. This capability transforms what might otherwise be a minor inconvenience into a severe availability risk, as attackers can permanently erase critical content including images, documents, and multimedia files that are essential for the functionality of community-driven or educational platforms built upon this plugin.
The impact extends beyond simple data loss to include potential integrity violations within the application's database layer. Since the vulnerability allows for the deletion of both file system artifacts and their corresponding metadata records in the WordPress database, it creates a state inconsistency if not handled with transactional safety by the underlying framework, although the primary concern here is the irreversible destruction of user-generated content. This aligns with the MITRE ATT&CK technique T1485 Data Destruction, where an adversary aims to disrupt service availability or destroy data on affected systems. The lack of authentication requirement places this vulnerability in a high-severity category because it can be exploited remotely by any internet-connected entity without prior compromise of user accounts, significantly lowering the barrier for entry and increasing the likelihood of widespread exploitation across sites using vulnerable versions of kboard.
Mitigation strategies must prioritize immediate remediation through software updates as well as defensive architectural adjustments if updating is not immediately feasible. The primary solution involves upgrading the kboard plugin to version 6.7 or later, where the developers have presumably implemented proper authorization checks ensuring that only authenticated users with appropriate permissions can delete media files associated with boards they own or manage. In addition to patching, administrators should enforce strict input validation and implement rate limiting on endpoints handling deletion requests to mitigate enumeration attacks. Furthermore, adopting a principle of least privilege for database accounts used by the web application can limit the blast radius if such vulnerabilities are exploited in other contexts. Regular backups remain essential as a last line of defense against irreversible data loss resulting from successful exploitation of this access control flaw.