CVE-2026-26984
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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2Tags
Description
LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. Prior to versions 26.0.5, 27.0.2, and 28.0.0, an authenticated user with sufficient privileges can exploit a path traversal vulnerability to upload a malicious file to an arbitrary location on the server. Once uploaded, the file can be used to achieve remote code execution (RCE). An attacker must be authenticated and have the appropriate permissions to exploit this issue. If the server is configured as read-only, remote code execution (RCE) is not possible; however, the malicious file upload may still be achievable. This problem is fixed in LORIS v26.0.5 and above, v27.0.2 and above, and v28.0.0 and above. As a workaround, LORIS administrators can disable the media module if it is not being used.
Analysis
Remote code execution in LORIS neuroimaging platform allows authenticated users with sufficient privileges to bypass path traversal protections and upload malicious files to arbitrary server locations. An attacker can leverage the uploaded file to achieve code execution on the underlying system, though read-only server configurations may prevent actual execution. …
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Remediation
Within 24 hours: Inventory all LORIS instances and document affected systems and data sensitivity levels; notify research teams and data custodians of the risk. Within 7 days: Implement compensating controls (network segmentation, WAF rules, access restrictions); assess feasibility of temporarily disabling vulnerable features if identified. …
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