CVE-2026-84802 in Craft CMS
Summary
by MITRE • 09/02/2026
Craft CMS versions from 5.7.0 before 5.10.12 contain an information disclosure vulnerability in AssetsController::actionMoveInfo that fails to enforce volume permissions. Authenticated control panel users can submit POST requests to the assets/move-info endpoint with arbitrary folderIds to retrieve asset count and total storage size for volumes they cannot access.
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Analysis
by VulDB Data Team • 09/02/2026
Craft CMS versions ranging from 5.7.0 up to, but not including, version 5.10.12 are affected by a critical information disclosure vulnerability located within the AssetsController::actionMoveInfo method. This flaw stems directly from an improper implementation of access control mechanisms where the application fails to adequately enforce volume-level permissions during asset management operations. The core technical deficiency lies in the validation logic that governs data retrieval for storage metrics, specifically allowing authenticated users with control panel access to bypass restrictions intended to isolate different content volumes within the system architecture.
The operational impact of this vulnerability is significant because it allows any authenticated user who has been granted access to the Craft CMS control panel to extract sensitive metadata about restricted assets without possessing the necessary permissions to view or interact with those assets themselves. By submitting POST requests to the assets/move-info endpoint and supplying arbitrary folder identifiers, an attacker can successfully retrieve two distinct pieces of information: the total count of assets contained within a specific volume and the aggregate storage size occupied by that content. This capability effectively bypasses the intended security boundaries between different organizational units or project segments managed within the same CMS instance.
From a classification perspective, this vulnerability aligns with CWE-200, which defines Information Exposure, as it involves the unintended leakage of data to unauthorized parties through normal application functionality rather than an exploit of code execution flaws. Furthermore, in the context of the MITRE ATT&CK framework, this behavior corresponds to T1087, specifically Account Discovery and potentially T1530 Data from Cloud Storage Object Databases if the volumes are mapped to external storage backends like S3 or Azure Blob Storage. The attacker leverages valid credentials to enumerate resources that should remain hidden, thereby gaining intelligence about the structure and scale of restricted data repositories which could facilitate further targeted attacks such as social engineering based on known file types or sizes.
The severity of this issue is compounded by the fact that it requires only authenticated access rather than complex exploitation techniques or unauthenticated entry points. This lowers the barrier to entry for malicious insiders or compromised accounts, making it a high-risk vulnerability in environments where strict data segregation between teams or clients is required. The ability to determine storage usage and asset counts can reveal business-critical information about project scope, client volume, or internal resource allocation strategies that are not meant to be visible across all user roles within the administration panel.
To mitigate this risk immediately, organizations running Craft CMS must upgrade their installations to version 5.10.12 or any later release where the permission checks in AssetsController::actionMoveInfo have been corrected. Until an upgrade is feasible, administrators should review role-based access control policies to ensure that users with minimal privileges do not possess broad permissions over asset management endpoints. Additionally, implementing web application firewall rules that monitor for anomalous POST requests targeting the assets/move-info endpoint with unusual folder ID patterns may provide a temporary layer of defense against automated enumeration attempts by external attackers who have obtained valid credentials through other means such as credential stuffing or phishing campaigns.