---
id: CVE-2026-55147
title: LORIS has incorrect access checks in API for Imaging Browser
summary: >-
  LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web
  application that provides data- and project-management for neuroimaging
  research. In versions from 22.0.0 prior to 27.0.4 and from 28.0.0 prior to
  28.0.2, the `…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-862
vendor: aces
product: Loris
affected:
  - 'Loris >= 22.0.0, < 27.0.4'
  - 'Loris >= 28.0.0, < 28.0.2'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-02T14:41:46.832954Z'
published: '2026-10-30'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T14:41:58.905Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55147'
references:
  - url: 'https://github.com/aces/Loris/security/advisories/GHSA-m48r-jv24-jjcx'
    label: 'https://github.com/aces/Loris/security/advisories/GHSA-m48r-jv24-jjcx'
  - url: 'https://github.com/aces/Loris/pull/10531'
    label: 'https://github.com/aces/Loris/pull/10531'
  - url: >-
      https://github.com/aces/Loris/commit/b13053597530ee33fbced35085d2490bc9ccc03a
    label: >-
      https://github.com/aces/Loris/commit/b13053597530ee33fbced35085d2490bc9ccc03a
  - url: 'https://github.com/aces/Loris/releases/tag/v27.0.4'
    label: 'https://github.com/aces/Loris/releases/tag/v27.0.4'
  - url: 'https://github.com/aces/Loris/releases/tag/v28.0.2'
    label: 'https://github.com/aces/Loris/releases/tag/v28.0.2'
tags:
  - cve.org
epss: 0.00215
epssPercentile: 0.11982
ingestedAt: '2026-11-05T19:30:42.669Z'
---

## Overview

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. In versions from 22.0.0 prior to 27.0.4 and from 28.0.0 prior to 28.0.2, the `API` for the `imaging_browser` module permits edits to imaging data without checking the frontend permissions that restrict editing in Imaging Browser. An authenticated `API` caller can therefore modify imaging data without the required edit authorization. Deployments that no longer use the `API` can disable it to remove access to this endpoint. This issue is fixed in versions 27.0.4 and 28.0.2.

## Affected

- `Loris >= 22.0.0, < 27.0.4`
- `Loris >= 28.0.0, < 28.0.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.